They have been neutered, yes. The violence started as just a bit of hissing and growling but since it have moved on to contact and fur flying, she is starting to feel very guilty about putting pickles through all that. Its mostly outside that the bullying is happening, she has tried keeping pickles indoors but she got very distressed and was pounding on the cat flap so she didn't think that was a very viable option.
I knew you had Kali back Lesley, but I didn't know about the other 3, what a shame! I think its awful that when marriages break up, the cats so often get turfed out rather than some sort of arrangement being made with one half of the couple.