At the weekend Mum and I went to the Harry Potter set tour at Levesden. http://www.wbstudiotour.co.uk/
It was totally awesome!!!

You get to see (and stand in!) the actual sets and find out about everything that goes on behind the scenes.
Mum and I both commented that, just watching the films, you can't see or comprehend exactly how much work goes into these things and the level of detail that is produced!
I'm not going to say too much, in case anyone is planning on going; but I will give some info people might find useful!
i) Get there early! They advise about 20 mins before your tour time and that worked for us!
ii) Allow yourself as much time as possible; we were in there for about 3 1/2 hours and we were a bit rushed!!
iii) If you are a photographer make sure your battery is fully charged, as (in all bar the first 2 bits) you can take as many photos as you like!
I would, definitely, recommend a visit!
Hugs
Liz