Ditto with Luke's post! If you haven't already, step one is get yourself to CAA Medical Centre at LGW for an initial Class One medical.
Next, start your research on which school you feel most comfortable giving your money to! Forget Bush/Airlines/Glossy pilot TV crap and jets, you've a loooooooong way to go and at the bottom of a huge ladder...
I would seriously recommend as part of your research, how likely the possibility of ever working as a pilot is and at what cost and then if you're still comfortable with this choice of career!