QRS,
It's a well known fact that unions cannot ballot for strike over "New fleet", as it is perfectly legal to start this fleet up. I very much doubt that you will lose £10k p.a. as you've predicted, at least for the next few years. New fleet is starting up with 500 cc. They won't have very many routes to start with. I know the unions keep crying about the high money earning trips going first, but in communications from the LT they've said that's not happening.
That said, however, I do not necessarily believe everything the company tells me. I would be stupid if I did. If I were you, I'd get in touch with your union and get them to ask the company asap as to which routes they are intending to give to New fleet. Hey, maybe you'll get lucky and they'll take away your "non-earners", such as Indian routes and Newcastle, who knows?
The main point is, that we cannot strike over the New fleet issue, whether we like it or not. I'd recommend all Union members to send an email to their rep as to what they are willing to forego from their t&c's. At least then you'll possibly have a say in the matter.
Gg