Afraid I've moved out now. Will try to answer your questions as accurately as possible.
one thing with the guitars etc, if you have them delivered the accomodation office people will be scared that you will play it at full volume (which is quite possible!).. In which case make up some bogus story like "I'm never going to unpackage it, it's a present for my uncle's 50th" or something, that's what I did!
Wolfson => strand along the river is a nice walk, takes about 20-25 mins iirc.
Postgrads are generally on those top floors, which all have refurbed kitchens etc so that should be nice! Mature students that are undergrads are littered around other floors, I had 3 on my floor.
I don't know of anyone that used the pool, but I know it comes with the guy's gym membership. Everyone I knew used the gym at Waterloo (you get a nice warmup run there and back as well!) since they have a good deal for students, although no swimming pool to my knowledge.
They do provide a bedding pack which is just a pillow and duvet (which are pretty crap!) I got my own, but you will definately need your own sheets. You get a lamp as well.
You will need plates, cutlery, pots, pans etc Washing Powder.. but you can easily get most this stuff when you get here from tesco pretty cheap and saves on travelling.
oh and a note for everyone is that you cannot access the internet until you have registered and gotten your list of usernames and passwords (you need your email login details).