Nom should be able to tell you the full history of who did what.
I was quite surprised the other day when Nominet told me over the phone exactly when a domain I had just registered had previously expired, who had previously owned it, how many times it had been renewed, when notices were sent out etc etc etc. and this was some time after it was deleted. (I was calling up after an inquiry from a 3rd party saying the name was theirs, nom records showed that they had let it expire).
I'd give them a call if I were you.