I'm in the same boat but we are being TUPE'ed across come April 1st. They have shown their plans and the head office will be in Woking, I work just outside Brighton. That is going to be 110 mile round trip a day up the god damn M23/25. They ARE NOT offering voluntary redundancy and I just can't see how this will work out, plus Woking already has it's own staff. Company seems to be manouvering to put people in an awkward situation.
you should also speak to ACAS
whilst they aren't offering voluntary redundancy, they may have cases of compulsory redundancy. if you have no mobility clause then good practice is to make your current position redundant, and (if appropriate) offer an alternative position at the new location
they should also consult the staff regarding these changes so you can find out more info and discuss your issues
if they don't follow that good practice and you have no mobility clause in your contract and they wish you to move, you may have grounds for breach of contract, as you consider the employer is making an unreasonable change to your contract
regarding TUPE, there is no six month rule that restricts the new employer from making changes to staff, making them redundant etc. if kraft bought cadburys yesterday, they could potentially make 19 people redundant tomorrow without consultation, 20 to 99 people requires 30 days consultation and 100+ requires 90 days, after the consulation period notice has to be given, but payment can be made in lieu of notice, so a new employer could potentially take on 2000 staff and make 1000 or more redundant in little over 3 months, or make 99 people redundant in little more than a month