Aphelio,
Any applicant must be eligible to work in the UK (i.e. should be a UK or EU resident or have a long-term visa/permission to work) - there's definitely different kinds of 'foreign'!
I assume there's also a requirement to have a certain level of spoken english but I don't know for sure... As for whether or not they actually recruit them, perhaps someone like Gonzo can answer that one.
Jen