Having looked again at the full package on offer, I agree it is probably one of the best on offer in the UK with one big caveat. The current Thomson management have previous history in downsizing and redundancies. Yes, if you get in and can avoid the chop for 10 years or so as Blue Baron has, then you're probably safe and have a job for life. But don't forget there was significant downsizing 3 years ago resulting in about 100 pilots being made compulsorily redundant - some of these had been in the company for 5 years so may have considered themselves relatively safe from such events.
Just a little warning for those considering leaving other jobs for the bottom of a long seniority list run by a ruthless management. It may work out and you've got a great job for life in a great company - just be aware of the background behind this recruitment, ie. the fact that there were significant redundancies 2 years ago.