I think the first advice you would get here would be if you have a flying job, don't leave just yet to go civilian.
Not sure what you need with your experience, also guess it depends where you are based, what is practical. Would think Bristol GS or Oxford Distance learning would be good options first for the ATPL's theory.
Modular option at Stapelford is quite good, and not to expensive.
CPL, ME IR - with your hours getting the CPL/ME IR will not be a problem.
However try to do your ratings, and don't leave your job just yet, as there are very few flying jobs around. But we all hope next year that has changed!
