I'm pretty sure that up to 5yrs from the expiry date of your rating, all you need to do is pass a flight test with an examiner. I was in a similar position (hadn't flown for several years, although I do work in the aviation industry). I did one flight with an examiner which included (IIRC) planning a navex, flying the first leg, starting the second, diverting along the way, a bit of g/h & pfl & rtb for a couple of circuits. Good to go!
ap
