Hi Ian,
As per the
Remittance basis 2022 (HS264)
Commonly foreign income and gains are ‘remitted to the UK’ if they (or something deriving from them) are:
Brought to, or received in, or used in the UK by you or another relevant person.
Brought to, or received in, or used in the UK for your benefit or that of another relevant person.
Used to pay for a service provided in the UK to you or another relevant person.
Used to pay for a service provided in the UK for your benefit or that of another relevant person.
Used outside of the UK for a relevant debt in the UK.
If you therefore use the savings for any of the above, it is taxable income.
Thank you.