Any route that is subsidised will be attractive for airlines as they don't really lose out on it. It's win win for them
So the 8 could be any of the following based on aircraft size:
Flybe
Loganair
Bmi
Eastern
Aer Lingus Regional / Aer Arran
Easyjet
CityJet - they have now ventured to CWL with the F50
Plenty of others but realistically I am struggling to pick an 8th candidate for LGW. If it had been any London airport would have said BA CityFlyer