Well I visited everywhere except Ulster and Glasgow, I wasn't too bothered about ow far away they all were just wanted to get a feel for the Uni's.
I haven't started yet and I don't move in until next saturday, so I can only base it on the open day but plymouth seemed like a really great place to go and the staff were all really friendly. I think the teaching is mainly in the PAHC which is about 10 mins on a bus from the main campus (which you get for free) they have all the people studying health related courses over there and there is a common room type thing and a library over there so it won't be too annoying if you have long breaks. They also have their 'opticians' open to the public which is in the centre of town but I don't think you really use that until third year.
The course is quite small about 36 people and you get given placements to go to at opticians in the Southwest as well, some of which have led to part time jobs or offers or pre-reg offers. I got the impression on the open day that the small size made it a much friendlier atmosphere and that the tutors got the chance to offer a little more individual help than other places might.
Sorry for the long reply, I can probably give you a better idea what it's like later in the year though. Are you going to go to the open days? I would really recommended it