I have a mate at Thomson and from his mouth, if time to command is a big factor for deciding on this job then don't bother. If its not then this is as good a deal as you are going to see in the UK for a long time, unless you think Monarch's plans will result in a safe and secure job.
Time to command is a piece of string fluttering in a gale force wind at the moment, ANY number mentioned is a guesstimate and MUST not form the basis for a decision to join Thomson.