Well in my family which are British for at least 8 generations, we've never needed a special school, bank account, butcher, etc... Surely being British is about adopting a culture and not trying to adapt it to your own background?
But you're talking about nationality here, we're talking about religion.
I'd say being British is having the freedom to follow whichever religion you want.
We are lucky enough to live in a country where you can follow whatever religion you want to without the fear of being killed over it (well, in theory

)
Your nationality, being british, surely dosen't dictate what religion you want to/should follow?
How long have Muslims being living and working over here? Have they ever needed a Muslim bank account in the UK before? No
As others have said, do people realise these accounts have been around for ages, it's nothing new. So with regards to your last statement they probably already have them

Granted they were with specialist banks but Lloyds have beein doing this for over 2 years now anyway. And in the past they might not have needed them, but doesn't stop them wanting them
I'm just playing devils advocate btw as I really don't see a problem with it. I know that yes it's probably the case that the majority of islamic followers are people not originally from this country, going however many generations back. Should we be like other countries whereby if you don't follow a certain religion you are persecuted?
I really don't see the problem people have with this.
Personally I don't actively follow any religion.