The above is the FAA way of doing things ignore it boi.
As you in a well payed job which you will dream about the working conditions and salary once you become a pilot.
You don't want the full time method because it will just cost you a fortune in lost wages.
1. Go and book a class 1 medical at Gatwick.
Welcome to the UK Civil Aviation Authority
2. Get your PPL you can do this by going on an intensive course or do it in your time off. Now the longer you leave this the longer it will take for you to be able to start the ATPL theory which you require for sitting the IR and CPL flight tests.
3. Enroll in one of the distance learning schools. There are plenty about a Fav on here is Bristol but you also have Oxford CATS and a few others. They are all pretty much of a muchness these days so choose one which is the cheapest taking into account travel and accom for the residential bit of the course. You will need to do a residential part and also go for exams at one of the test centers.
4. While studying for ATPLs you will need to build your time up to 150 hours try and get as much PIC time as possible also you need to have done a Night rating and also fit in a multi engine piston rating. Night rating get ASAP when its dark after PPL it can be a right pain getting that one in. It maybe worth doing 2 weeks in Florida hour building and get done there.
Then come back here and ask about CPL and IR schools you need to do both courses and two flight tests and to be honest its when you start paying out the bulk of the cash there is also a time limit from when you finish the ATPL exams. Budget about £25k for this stage.
There is a document on the Caa website called CAP 804 and that tells you want you need for all the different sections.