You can stay on and do further education after the degree. I know a few people who are planning to do that. It generally leads into academia, but can help in getting other jobs and means you start off further up the £ ladder.
In hospital, and community for that matter, as part of Continued Professional development, which is a mandatory ball ache now associated with pharmacy, doing a clinical diploma can sort that out and make you a better pharmacist.
Basically though, if you want to do Phd and further studies, if youre good enough, it won't be a problem.