Booper13 after your AML as I'm sure you know, you don't have the right to come back to the same job necessarily. If that's not possible, because for example the same job doesn't exist, then you must be offered a suitable job on no less terms and conditions, which it does sound like this probably is, particularly as the actual job is the same, it's just the geography which is different.
The reality is, if your previous exact same job no longer exists and restructuring has changed the working arrangements of it, you probably can't challenge it. This is all assuming that the restructuring is 'genuine' and they haven't just changed the geography of your job with no good reason. And the fact that your personal circumstances have changed which means you would find this new arrangement difficult is irrelevant, the new job must be reasonably similar and on same terms and conditions as your old job.
Were you consulted at all about the changes to your job/restructuring in general?
Your contract of employment must legally state where your normal place of work is, can you check again? It should say something about where you work, and often includes something about changing this, or being flexible or similar.
Just another point, don't assume that a change in geography will necessarily mean a flexible working request is unlikely to be granted. I don't know what you had in mind, but if for example it would involve a job share or similar, the geographical area could be split in two or something.
A good flexible working request may be the way to go.