Well, while I was recovering from surgery seemed the ideal time to leave the cat sprayer switched off since setting it was beyond my frail and fragile post-op body (or something). It went okay for about a week, we had some rain in that time which keeps the enemy cat away normally anyway, and on the nights that were dry it didn’t come around. However, it eventually realised the device was off and we got up one morning to find it had sprayed and the place stank. It did it again during the day, a day or so later. We started turning the water sprayer on again in the evenings and that seems to have worked.
Except one day over the weekend we were both sitting in the computer room, Fizz was resting on her chair (hard day in the sun and she needed a break). We heard a cat-chirp and both looked and the little bugger was either just coming into the room or just leaving the room and sprayed the bloody woodwork as it left. Since we managed to catch it so early it was easy to clean off and left no smell but the little shit is clearly getting braver.
Having said that, we’ve not set the sprayer for a couple of nights again since our cats are out so late when the weather is this good and it’s not been back, so I think we’re wearing it down slowly. I’ll set it tonight I think, just in case.