'Buying back' pensions after Bankruptcy

vonvonvon

My BIL used to work for himself as a builder however he was made bankrupt several years ago after a series of unfortunate events, clients not paying etc. My sister only managed to keep their home by ‘buying’ his share in it for £1, but it cost her several hundred pounds to do this.
Years later, they have now been notified by the official receivers that his 2 private pensions which they took as ‘assets’ are useless to them and are asking him to make them an ‘offer’ for them. I think they are both worth about £10K. Is there likely to be a ‘catch’? What is likely to be considered a ‘reasonable’ offer?
Any advice gratefully received.