I agree BA isn't the best, but being that route is BOS-LHR-EDI-LSI and back risking missing a connector in that 24hour period isn't worth the extra hours in airports or planes for the savings.
I could go KLM to AMS then EDI or AirFrance Via CDG, then spend a night in EDI or get on a boat from ABZ.
I know all the possible common routes.
I do miss the days of free flights, but price isn't the issue, the car seat quest is.