Hi Wilky.
It sounds like you're in an enviable position, having the time and money to take the plunge into commercial aviation. Good luck.
I don't know anything about Tayside but I'd definitely train with them rather than head overseas, especially if they can do all of the PPL/CPL/ME/IR/MCC in one place. It sounds perfect for your situation. You get to stay local, keep your income, and start living your dream. Flying training itself is such fun mate.
I'd recommend using Bristol Ground School for the distance learning part of the ATPL. Excellent reputation, materials and online support. The course is incredibly flexible, allowing you to fit the study and exams around your job. Don't forget that the distance learning course requires two periods of a fortnight each when you'll be required to attend the school's HQ at Cheddar, plus a week of exams following each revision course - just thinking of your leave allowance.
Welcome to Pprune.
MH152