Hmmm is someone trying to get a freebie out of the vets I wonder (think about it x-rays, and initial op). I think the consent would have been given by his partner and she is just too scared to admit it to him, for all we know he could beat women and hence why she denies it.
As the cat is not a pedigree can't see the problem or has he gone in there saying it was a pedigree when having a go at the vets.