Coming back from Panama on Iberia, I have the choice of connecting (not on a through ticket, and with a checked bag) to LHR and then to Edinburgh arriving at 6pm - with a 90 min connection at Madrid. Perhaps can go hand-luggage only, would that mean we'd avoid Spanish immigration, since there would be no luggage to collect and re-check?

Or I should I have a long wait in Madrid and take Easyjet at 6pm direct to Edinburgh and get home 2 hours later.

I am UK and partner is Spanish, as far as passports are concerned, and all Madrid flights (other than Easyjet at T1) are meant to be from T4S.

So do I go BA, or go for a long lunch? And where would be the best place near the airport for a good lunch?

(Last time we transited at MAD, on a through ticket, there was fog at Heathow and so the BA flights were very delayed and we got back to Scotland after the late Easyjet flight! This trip will be in January, so fog again is highly possible.)