I have a bank account in the UK and in The Netherlands. Transferring money from my UK to my Dutch bank account costs £25 with my current bank and most other banks have similar fees. The Money saving expert notes that there exist some fee-free transfers when accounts are with linked banks. But I also found that both NS&I and the Post Office have what appears to be a fee-free international payments service. That appears to be a major advantage over the competitors, and this is not mentioned by the Money saving expert. I wonder if I'm missing something.
Note: This question is different from Which UK banks have an account that features free online incoming/outgoing international wire transfers and no monthly charges?. Firstly, I am willing to accept the limitation that both accounts are in the same name. Secondly, the accepted answer to the linked question is incorrect, because it provides a service that does not allow for free outgoing transfers. Thirdly, I am not interested in receiving money, only sending. Fourthly, The linked question asks for no monthly fees, my question does not.