@PNW_Peepers and
@Cbarr00 Thank you for your great suggestions however we don't leave our girls out when we aren't home, they are locked in their run so cat can't get to them, could fit a paw through the wire fencing but I'm sure girls are smart enough not to sit against the fence while it's there. Having a sprinkler wouldn't work for two reasons, one is our garden is L shaped as we live on a corner, part of the L shape leads onto public footpath, so having a sprinkler there would wet anyone walking past so we wouldnt be able to have one on that part and all the cat would have to do is walk around the corner and enter the garden that way. Also having a sprinkler in the main part would mean every time we enter our garden we would get wet too.
@PNW_Peepers I understand your point about being someone's pet but this isn't about being a hassle this is about me not wanting my girls harmed. My daughter hadn't realised the cat was in the garden when she let them out of their run because it has good hiding skills however I've cut down a lot of bush and shrubbery so makes view clearer. The cat lives two doors away from us and I can often hear it coming so can chase it away but it is when I come indoors for lunch or to get warm, what ever, I have to rely on the girls to sound a warning which usually they do and do so a lot even when a little blackbird rustles in a bush but that day they hadn't realised the cat was there hiding.
I recognise your empathy toward my neighbours and their cat but they didn't consider us or our feelings when they made complaints which led to us having to be without our ducks which I am no where near healed from the loss of them, so I don't see why I should consider their feelings or wants.
The cat doesn't have a collar so I doubt they'd put a bell on it, plus we are on condition about having the girls as the housing authorities stipulated that they would only turn a blind eye to us having them as long as no one complains and I can't risk these neighbour making complaints about us having our girls so I dare not approach them to ask for the bell. It would probably be a case of me asking please could you put a bell collar on your cat so it can't sneak up on my chickens and them saying- you shouldn't have chickens here anyway.