Bank of England base rate reduction – 18 December 2025

On Thursday 18 December, the Bank of England base rate (Bank Rate) was reduced from 4.00% to 3.75%.

As a result, the interest rate on all Siberite mortgages that track the Bank Rate will reduce by 0.25% from 1 January 2026.

The Siberite Mortgages Standard Variable Rate (SVR) is also reducing by 0.25% to 8.09% from 1 January 2026.

If your interest rate is changing, we’ll write to you at least four working days before your rate changes to tell you your new rate and monthly payment amount. You don’t need to do anything until you receive our letter.

Quickly estimate your new monthly payment

You can check the effect of a rate reduction now using our new rate change calculator.

You’ll need to know your current balance, repayment type, interest rate and remaining term. The calculator will show you how much your monthly payment is likely to change.

Use calculator

See your new rate and monthly payment in Self-Serve

If your interest rate and monthly payment are due to change at the start of the next month, you’ll find details of your new rate, payment amount and the date when this will apply.

This will be available to view after we have processed the rate change on your account. We’ll do this as soon as possible, although it can sometimes take several days.

If you call us, we won’t be able to confirm your new rate and payment until it’s also showing in Self-Serve. So, if it’s not there, please check back later.

Sign in now – if you’ve already registered on Self-Serve, you can sign in to your account at any time.

Register now – to use Self-Serve for the first time, you’ll need to register and create your secure account.

Not all customers can register for Self-Serve. You can see more details on our using Self-Serve page.

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Bank of England base rate reduction – 18 December 2025

Quickly estimate your new monthly payment

See your new rate and monthly payment in Self-Serve

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