HH,
Precisely, the DHC6 LGW service barely paid for itself and once Air UK pulled off the EXT/LGW route Brymon jumped at the opportunity to operate PLH/EXT/LGW picking up/dropping off a mere 2 or 3 pax in EXT on the way thru.
The NQY/LHR HPR7 route was profit making, 70% (ish) load factors on those kind of airfares was a good load factor, BMA had operated the HPR7 route before Brymon, alas Brymon part exchanged the HPR7 towards the purchase of 4 DHC7's (2 for ABZ, 1 for PLH and 1 for NQY), PLH and NQY services were only supposed to be combined for one season and until the 4th DHC7 arrived but the 4th DHC7 never did arrive and services remained combined for nigh on the next 30 years!