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Thanks all. I hadn't considered the effect it might have on my insurance.
I live in Cumbria where 90% of the cameras here are mobile, and you tend to either know when and where they are, or oncoming drivers flash their headlights to warn you. Of course, I got caught by just about the only fixed camera in the area, which I wasn't aware of as it's an area I don't often travel through. I also passed it six times over the weekend - I got caught the fourth time and was silently crossing my fingers that I hadn't triggered it more than once. It was also hubby's car, so I couldn't hide it from him!