Tell me how you think otherwise regarding spiral reduction in pay and terms in Virgin if we do not stand firmly with the union but sell our souls ?
The fact is, this is a lost cause before it starts. So make the best of it now and take the money.
Then, at the earliest opportunity, sack Unite and re-group with a better union who know what communication is about and have the balls to ask the management for what you want, not given the company the impression everything is rosy and they have a deal their members will accept (when the haven't asked, and STILL haven't asked, what their members want).
This is now like that final scene in Carry On At Your Convenience. The strike is futile - just get back to the job (presumably you enjoy) and learn from the mistakes this time round. Yes, you lost out on the 4.8%, but that was an error of your own making because some people where under the impression there was more money in the pot without doing the maths.