Mortgage Rates Are Moving Again: What the Middle East Conflict, Inflation and Swap Rates Mean for Your Mortgage

If you've been watching mortgage rates recently, you may have noticed something that initially seems confusing.

The Bank of England held Bank Rate at 3.75% in September, yet many fixed mortgage rates have become more expensive.

So why are mortgage rates increasing when the Bank of England hasn't increased the Base Rate?

The answer lies in the way fixed-rate mortgages are priced — and, right now, events happening thousands of miles away are having a very real impact on mortgage borrowers here in the UK.

Let's break it down without the financial jargon.

What has happened?

The Bank of England voted in September to keep Bank Rate at 3.75%.

However, it wasn't necessarily a comfortable decision. Six members of the Monetary Policy Committee voted to keep rates unchanged, while three voted to increase Bank Rate to 4%.

The main concern is inflation.

UK CPI inflation increased from 2.9% in July to 3.1% in August, moving further away from the Bank of England's 2% target.

A major reason for the increase has been energy and transport costs.

The continuing conflict in the Middle East has contributed to significant increases and volatility in oil and gas prices. Higher energy costs can then feed through into fuel, transportation, manufacturing and eventually the prices we pay for everyday goods and services.

And that matters enormously for mortgages.

What does a conflict in the Middle East have to do with my mortgage?

At first glance, very little.

But the connection becomes clearer when we follow the chain.

Conflict and uncertainty → higher energy prices → higher inflation expectations → higher market interest rates → more expensive mortgage funding → higher fixed mortgage rates.

The Bank of England reported in September that Brent crude oil and UK wholesale gas prices had risen substantially since its July report.

It now believes CPI inflation could move to slightly above 4% in early 2027 if these pressures persist.

Markets therefore have to reconsider something very important:

Where will UK interest rates be over the next few years?

If investors previously expected interest rates to fall but now believe inflation could remain higher for longer — or that the Bank of England might even need to increase rates — the market price of longer-term borrowing changes.

This brings us to swap rates.

What are swap rates?

Swap rates sound complicated, but the basic principle is easier to understand.

When a lender offers you a fixed mortgage for two or five years, it is effectively agreeing that your interest rate will remain fixed regardless of what happens to interest rates during that period.

The lender therefore has to manage the risk of providing that fixed rate.

Financial markets allow lenders to manage this interest-rate exposure, and SONIA swap rates and related market funding rates are an important reference point when lenders price fixed mortgages.

Think of them as part of the wholesale cost environment behind a fixed mortgage.

If market rates fall, lenders may have room to reduce fixed mortgage pricing.

If they rise sharply, lenders may need to increase rates.

This is why watching only the Bank of England Base Rate doesn't tell you the whole story.

Bank Rate and swap rates are not the same thing

This is probably the most important point.

Bank Rate is set by the Bank of England's Monetary Policy Committee.

It has a particularly direct influence on variable borrowing costs and the wider economy.

Swap and market rates, on the other hand, reflect financial-market expectations about future interest rates, inflation, economic conditions and risk.

Markets are constantly looking forward.

They don't wait for the Bank of England to make its next decision.

If markets believe the Bank might have to keep interest rates higher for longer, that expectation can be reflected in funding markets today.

Mortgage lenders can therefore increase fixed rates even when Bank Rate hasn't changed.

And the opposite can happen too.

Fixed mortgage rates can sometimes fall before the Bank of England cuts Bank Rate if financial markets believe future rates will be lower.

That is exactly what we're seeing now

The Bank of England said in September that increases in short-term market rates had passed through quickly to borrowing costs.

It estimated that quoted two-year fixed mortgage rates were around 0.95 percentage points higher than before the current Middle East conflict began.

That is a substantial movement.

It also explains why mortgage pricing can change so quickly.

A lender might launch a competitive mortgage product and then withdraw or reprice it only days later because the market cost behind that product has changed.

Equally, if market conditions improve, lenders may start reducing selected rates again.

Mortgage pricing isn't moving in a straight line.

Why inflation matters so much

The Bank of England's inflation target is 2%.

August CPI was 3.1%, and energy prices are creating further uncertainty.

The problem isn't simply that petrol or gas becomes more expensive.

Policymakers also worry about what are called second-round effects.

For example, if businesses face higher energy and transport costs, they may increase their prices.

Workers experiencing higher living costs may seek higher wages.

Businesses facing higher wage costs may increase prices again.

If that cycle becomes established, inflation can become harder to bring back down.

This is why the Bank of England is being cautious.

Does this mean Bank Rate is going up?

Not necessarily.

Three members of the Monetary Policy Committee wanted an increase in September, but six voted to keep Bank Rate at 3.75%.

There are still forces pulling in the opposite direction, including a relatively soft labour market and restrictive borrowing conditions.

Much will depend on what happens with energy prices, inflation and the wider economy over the coming months.

If geopolitical tensions ease and energy prices fall, market expectations could change again.

If energy prices remain elevated and inflation becomes more persistent, the pressure on interest rates could continue.

Nobody can reliably predict exactly where mortgage rates will be several months from now.

That is why I generally prefer planning around what we know today, while continuing to monitor the market.

What does this mean if you're buying a home?

If you're planning to buy, don't assume that waiting automatically means getting a cheaper mortgage.

Rates could fall, but they could also rise.

For a first-time buyer, I believe one of the most useful first steps is getting an Agreement in Principle (AIP).

An AIP helps establish approximately how much you may be able to borrow and puts you in a stronger position when you start viewing and negotiating on properties.

Once you have found a property and are ready to proceed, we can assess the available mortgage products based on the market at that time.

And the job doesn't necessarily stop when a mortgage product has been selected.

Where lender rules allow, I continue monitoring the market during the application process. If a better suitable option becomes available before completion, we can consider whether changing the product is appropriate.

What if your fixed mortgage is ending?

This is where planning ahead can be particularly valuable.

If your current fixed rate is due to end within the next several months, I wouldn't automatically wait until the final few weeks.

Depending on the lender and circumstances, it may be possible to start reviewing your options several months before the existing deal expires.

That gives us time to compare staying with your existing lender through a product transfer against remortgaging elsewhere.

It can also provide more time to react if the market changes.

Securing an available option early does not necessarily mean ignoring the market afterwards. Where possible, I continue to monitor rates up to completion and advise clients if something materially better becomes available.

Don't try to time the mortgage market perfectly

This is perhaps the biggest lesson from the last few years.

Mortgage rates are affected by far more than the Bank of England's latest announcement.

Inflation, energy prices, government bond markets, swap rates, economic data, global conflicts and expectations about future monetary policy can all influence what lenders offer.

Trying to identify the exact bottom of the market is extremely difficult.

A better approach is usually to understand what you can afford, secure an appropriate option when you need it and continue reviewing the market while there is still an opportunity to change.

The bigger picture

September 2026 is a good example of why headlines such as “Bank of England holds interest rates” don't necessarily tell mortgage borrowers what is happening to mortgage pricing.

Bank Rate remains at 3.75%.

But inflation has risen to 3.1%, energy prices remain volatile, markets have reassessed the outlook for UK interest rates and mortgage funding costs have moved with them.

That is why some fixed mortgage rates have increased.

The good news is that mortgage markets can move in both directions. If inflationary pressures ease and market expectations improve, fixed-rate pricing can improve without waiting for a formal Bank Rate cut.

For borrowers, the important thing is not trying to predict every market movement.

It is being prepared.

At Cambs Ely Mortgages, I monitor mortgage products and the wider market to help first-time buyers, home movers and remortgage clients understand their options.

If you're buying a property, approaching the end of your fixed rate or simply want to understand how the recent market movements affect you, get in touch and we can review your position.

Building Blocks for a Brighter Future.

Important Information

This article is for general information and reflects market conditions and published economic information available at the time of writing. Mortgage rates, swap rates, inflation expectations and lender products can change quickly.

Any figures or market examples referred to in this article are correct at the time of writing and should not be treated as a prediction of future rates.

Mortgage availability and the rate available to you will depend on your individual circumstances, property, loan-to-value and lender criteria.

Your property may be repossessed if you do not keep up repayments on your mortgage.