Hi!
I am a current third-year history student at Lancaster University, and thought I could give you some insight into the questions you asked.
While I can't tell you much about Biomedical Sciences itself, I can tell you a bit about the university. The university has a collegiate system, which means that the university is broken down into colleges and in first year you live in your college. I thought this was really good because it makes the university seem less overwhelming - you're still surrounded by a lot of people (so you can find the people you want to be friends with easily) but you won't get lost/left behind. It's a relatively small campus, but there is plenty to do, and it is also a really beautiful campus.
For most people considering Lancaster the main con is that Lancaster doesn't have a huge clubbing scene - there are a few clubs for those who want to go, but it definitely isn't something everyone does. There are plenty of other things to do, both in the town and at the Uni. There is basically every society you can imagine, from academic ones, sports ones and other creative ones like Baking society, so there should definitely be something you can find to fill your time with.
Please let me know if you have any more questions that I can help with!
~ Georgia