Well, if I have correctly read the FPP presentation, we can apply even if we have work experiences and flying hours of general aviation ...
Correct (though not too sure what you mean about "work experience" - I presume you don't mean flying work?). I have some time on powered, gliders and paragliders and got in. At the interview stage they certainly want you to demonstrate an interest and a passion for flying. I'd say never having flown would be a fairly large hinderance.
Is there any non-uk citizenship who were shortlisted those last years?
Yes, I met a couple of people in 2013 and 2014 who were EU citizens (though not sure if they got an offer they certainly attended some of the later selection stages). Both spoke English as a second language. Be aware though that a lot of native English speakers found the verbal reasoning test one of the tougher parts of selection.