Almost all of Yorkshire fall's in Manchester's catchment. I actually spent the first 18 years of my life in Barnsley and people seldom used LBA.....it was always MAN and perhaps EMA. SZD, when it was operating, served a niche at best.
I operate flights out of MAN (and sometimes LPL) and during the Scottish holidays certain routes are filled with, yes you guessed it, Scottish families. This demonstrates how further more the MAN catchment extends on a secondary basis.