If you're making a transfer in GBP to a beneficiary in the UK, there's a value cap per transfer, as well as daily and weekly limits:
If you go over any of these limits, your domestic GBP transfers will be processed as SWIFT (international) transfers. If you’ve already exceeded your free allowance for SWIFT transfers, you’ll be charged the £3 international fee.
Please note, SWIFT transfers can take up to three working days to arrive at the beneficiary’s account.
These limits are applicable to outbound domestic GBP transfers only.