There’s actually a pretty substantial Islamic banking industry in the UK, both consumer banking and Islamic banking.
Of course, the ironic thing is that jobs in Islamic banking in the west are extremely hard to get into, unless you already have experience working in the rest of banking - Islamic banks and Islamic banking divisions of other banks prefer to hire experienced bankers who now want to get into Islamic banking.
Which means the only way to become an Islamic banker is to spend a couple of years being a haraam banker. Wonderful, eh?