Ricky Hill J residence tried to get me back for a PCR test, I arrived on the 2nd March. Told them not a chance as its not required. I sent the nurse a picture of my ATK test I did at home and they accepted it.
another thing to look into would be asking your company or even the client (they will have some more pulling power) to have you tested onshore before you fly. This could also open a can of worms for the 14 day quarantine tho. Tread carefully on that one. 2 weeks in a hotel then Thailand until this blows over is still better than months in sunny Scotland.