Redstar is correct, you are not legally entitled to any compensation for a move as such.
However there is an arguement that can be made for compensation if you have lost certain benifits as a result of the move, eg office canteen, (nippng round to M&S for a sandwich wouldn't count). I've also heard stories of staff who are unable to move due to an inability to get to the new site, being ruked as construcitvely dismissed and entitled to compensation as a result. Not sure how through these are
You won't get anything if you don't ask and much and if you are in a union, you should ask them for advice