Without knowing how old you are, just check that you are entitled to tow a trailer with your licence. It used to be that when you passed your test, you automatically got the B+E category added, but now (can't remember offhand when it changed), you have to pass an additional test before you are allowed to tow.
Edit: Linky to current regs. It appears they changed again at the start of this year.
Edit: Linky to current regs. It appears they changed again at the start of this year.