I did this, moving from Lancashire to London. Though I was really lucky as I worked for a Bank, got a transfer through them and got a room in the Banks Halls of Residence. Met loads of people, had a fantastic time and ended up meeting Mr Spudqueen (through a friend of a friend). Moved to Manchester with Mr Spudqueen, then the Wirral, then Devon and am now back in Lancashire, not 10 miles from where I originally moved from, though this is due to Mr Spudqueens work not an actual desire to move back here! Twenty something years after moving to London I am still in touch with a couple of the friends I made down there and have some great memories.
I'd go for it, if not you'll always be wondering what it would have been like. I found it to be a very liberating experience, I felt that I actually 'grew' after moving away, I became much more my own person and experienced things that I wouldn't have done if I'd stayed in my home town.