I've had to play in the orchestra and choir for like 5 years so could that count as teamwork?
You make these things sound like chores- really, extra curriculars should be things that you enjoy, let you have fun, relax, and still gain things from. Find something that you love. There is no list of special extra curriculars that are better than all the others.
The most general thing is, if you are trying to tick boxes, have a broad range.
Get some work experience, that tends to be more important than extra curriculars.
I would say that extra curriculars aren't that important (I dont have any really besides football a few years ago), just enough to show your a rounded person.
If you're looking to do more though, look into things that involve teamwork, particularly if you're going to be applying to any PBL universities.
I have no extra curriculum activities whatsoever apart from playing badminton with my aunt each sunday.
But so far i've been to the school of pharmacy which is part of UCL for a week but apart from volunteering in hospitals etc i don't know what would make me stand out from everyone else
There are no "best" things to do.
I suppose it might be a good idea to have something that shows leadership, something that shows teamwork, something that shows organisation etc. But you can probably think of an example of something you already do.
I think they want to see that you're a well rounded person, but also that you're not just doing things to tick boxes and are enthusiastic about it! Extra cirriculars can be used in your personal statement to emphasis ability to work in a team, show leadership, etc but work experience and demonstrating a committment to medicine is probably more important overall.
(3rd year medic at bristol.)