If only the Britannia brand could be revived, but sadly I think that's just wishful thinking Lee Baker Street.
Definitely wishful thinking I'm afraid! Bear in mind TUI is headquartered in Germany!
Thomson have actually increased Summer capacity at LTN since B737-800's have been based here. After the withdrawal of the 737-200 fleet in 1993, the Summer contingent was two 757's for many years. More recently we have seen one 757 and two 737-800's. Remember too that in the heyday of 737-200 operations, at least a quarter of the flying was MOD charters to Germany etc.
Thomson have been around for a long time and know the business very well. Much of the operation is geared around big change-over days at resort airports which allows an efficient use of coaches and reps etc. Simply adding additional random flights to certain destinations doesn't always work but its common to see extra PMI & IBZ night flights in the peak months added to the program each year if the demand is there.