I guess this is something that might have changed - but I definitely recall being charged for making transfers from Poland to the UK, and same very recently for Switzerland <-> UK transfers. In both, rather insidiously, the outgoing bank cannot tell me what the final fee will be, and I only find out what was charged when less money appears in the recipient account than what I sent.

There is no fee to send money from your TransferWise Borderless UK account to another UK bank account.

New Zealand too.