Hi,
There is no limit to the amount of money you can transfer from an overseas bank account to a UK bank account.
If any of the money transferred is from income or capital gains arising in the tax year it is transferred, then that income and capital gains is taxable and should be reported on a Self
Assessment tax return.
If the money transferred is purely from savings, it is classed as capital and is not taxable unless they generate interest or dividends.
These would then potentially be subject to tax.
Further guidance can be found here:
Tax on savings interest
Tax on savings interest
Tax on dividends
Tax on dividends
Thank you.