I said I'd keep posting so here I am. Got my Class 1 back after Post RAI scan showed no metastasis. 4 weeks it took to recover my blood to Eutyhroid status. CAA sanguine, less than 1% chance in the next 5 years of lung metastsis leading to incapacitation - bingo. Quick Sim - Quick recency fliight with a Trainer and whamo, back into the Short Haul fray at LHR. Typing this on the Champs Elysee, Paris on a layover. Wife also doing well. She's clear too and back to work.
Cheers to all who offered advice and support.