You're young, you don't have responsibilities, you'll have a blast living in London for a few years.
Unless you are minted, and I mean very comfortable indeed, around your late twenties you'll want away, get bored, and move further out, in fact you'll start to miss Liverpool. And when you miss home, it really does it hit you.
But when you first move down, just enjoy yourself, the whole world is there, every cultural experience, and women from every corner of the world -- if you can't enjoy a few years in the big smoke you won't have experienced all that England can give to a man. Live it up.