Once your Class 1 is sorted and you're on your way with your PPL, I would highly recommend heading up to Stapleford Flight Centre (near Romford, Essex) to have a talk with them about a training plan. They have an excellent reputation of training career changers via the modular route (including me). They also have a brilliant reputation with airlines, and the instructors are all fantastic.
Whichever ATO you choose to train at, be sure to do your homework and research them thoroughly, as well as going along to visit their facilities and speak to students and instructors.
Best of luck
RR