My wife had this sort of situation – she was unfairly dismissed (incorrect process, was told that ‘as she was pregnant they assumed she would be leaving anyway’ – no really).
We assumed a compensation claim would be honoured but then they told her they had sacked her boss and were offering her the job back – if she didn’t accept it she couldn’t claim unfair dismissal either.
Fortunately they were actually okay about it (when she said she felt unable to go back to the office after going though all this – including her colleagues being shown the scoring matrix they made up in order to justify her selection – and she got a very enhanced redundancy package which wasn’t far off what she would have got through the courts but without the stress of doing it.