As SSH says, It's not hard to turn Lossie into the Q airfield and the MEDA airfield. The MEDA work is being carried out at Brize as we speak since Lynham won't be doing that job any more.
As for Q, Again I'm a person that understands it having spent 4 years on F3s. Easily done from Lossie. The jets will intercept bears quicker from lossie anyway. As for airliners that have "radio trouble"..well that depends where it happens, it may be quicker or slightly slower to make it to them from Lossie. A highjacked airliner on the other hand...That depends entirely on when and where it is hijacked, and at what point the controllers become aware and call the scramble wether the jets will make it in time...but thats the case with leuchars anyway, if the airliner is taken when its 10 miles out from EDI then it can be used as a flying bomb long before QRA make it there regardless of where they take off from