I've just accepted a clinical diploma place for this coming academic year (from sept). Its is a 2 year course, 1 day release from work each week for 12 weeks/semester i think it is to do more clinically focused work on subjects that crop up in day to day work.
Its being paid for by my employer (NHS) whihc is great. You don't need a diploma to work in hospital pharmacy, but it is a requisite for getting senior jobs.
Personally, after 2 years away from uni, i'm quite looking forward to going back to that kind of environment (not to mention the perks you get with the student card!)