Hi Jo, maybe a good move to go to your local flying club and look into having a trial lesson, bit different to the 777 sim granted. If you enjoy it, chat to an instructor about the PPL, you dont have to do it there but doesnt do any harm to pick your instructor's brain while you're there.
Maybe get your PPL, and start from there. And this forum is always good for info etc. As Im sure you're aware, the commercial job situation aint too good right now, but that doesnt stop you planning ahead a wee bit.
That's probably what I would do first of all anyway, a trial lesson, take it from there. Good luck, keep us posted.
PS. If youre aim is to be a commercial pilot which it is, a class one medical is required from the CAA so that's important before you embark on any commercial course.