Eureka/I have found the answer!
A couple of days ago, one evening, I was looking out my window into the garden admiring the fast rate of growth
I spotted the neighbours cat preparing to lay one of it's eggs. I legged it outside, livid, with intent to commit felinecide.
Well the cat disarmed me by doing 'nobody loves me' type miaowing and coming closer and closer. I went back inside, just managing to close the cat out and me in.
For some reason, we've got a toy cuddly lion about 3 foot long. I picked it up and took it outside making lion noises (as best as I could - nevermind what the neighbours think anymore ). The cat, surprisingly, seemed fooled by this and tried to leg it out of the garden, to get away from the hungry lion that had presumably escaped from the zoo!?
Of all the places the cat could have chosen to scramble over the low wall and up the fence, it chose where I have put my 2 large cacti It got off these quickly, found another exit and I haven't seen it since. I'm pleased to report I've not seen it since, touch wood, and thankfully the cacti are undamaged.
I know, I'm a very bad person