Not just GBP, I also have a USD account with them and other currencies are available.
Can make payments from anywhere into it and to anywhere out from it.
It's on SWIFT, CHAPS and the other one, can't remember the name.
Transfers to and from UK accounts free, but overseas payment outwards are charged.
Free ATM in UK, and also when paying by card PIN or contactless.
Other difference? No problem for non-UK residents or any other Nationality to open an account, although not sure about USA as they seem to have problems everywhere 'cos of FACTA.