Thomas Cook at CWL was a single aircraft A321 summer base with no winter service, which has been the case for a number of years, although until a year or so ago it was an A320.
BRS was 3 x A321 in summer although for part of the summer one of the 321s was replaced by a 320 in a pre-planned move. In winter BRS was a single A321 base.
As has been said, EXT had no Thomas Cook presence.
Thomas Cook was handling around 500,000 passenger journeys annually at BRS so some scope there for other carriers/tour companies if they have a mind.