My partner works at a big corporate with around 2,000 employees in their London office. There's probably hundreds of other offices around the world, definitely others in the UK too. For a while now there's been rumours that they're going to relocate the London office from one side of the city to the other. This would be hugely annoying for her as it'll more than double her commute time. Cost wise I don't think she'll lose out, but where they are currently is a slightly less 'corporate' area, whereas if the rumours are true they'll be with the suits and bankers amongst the skyscrapers. Grim 
So for her it's a lifestyle change that'd suck. We live in London so it's just the time traipsing across the city that'll suck. For many of her colleagues that commute into London the cost and time difference are going to be massive though.
So what is the law around this? If the rumours are true and they do pull the trigger and move, what can her and her colleagues expect? A relocation bonus? A threat to sign a new contract or else be let go?
I'm sure the first question will be "what does her contract say" and to that it's the same as every other contract I've seen; "Your usual place of work will be XXXXX location with the need to work in another location from time to time". So nothing of use really.
TIA.

So for her it's a lifestyle change that'd suck. We live in London so it's just the time traipsing across the city that'll suck. For many of her colleagues that commute into London the cost and time difference are going to be massive though.
So what is the law around this? If the rumours are true and they do pull the trigger and move, what can her and her colleagues expect? A relocation bonus? A threat to sign a new contract or else be let go?

I'm sure the first question will be "what does her contract say" and to that it's the same as every other contract I've seen; "Your usual place of work will be XXXXX location with the need to work in another location from time to time". So nothing of use really.
TIA.