And BMA Heralds and Fokkers on the CI routes too. Don't remember 737s on those but of course we had 737-400s operating the Air 2000 First Choice holiday flights from Luton for at least a couple of summers.
Yes part of the spectators building or an add on was kitted out for domestic operations but I'm not sure if it was ever used- it's all a blur now but think it was when Capital Airlines were operating domestic services.