We don't get on with our neigrabroadours after a dissagreement last summer but not much happens with them apart from ignoring each other. Just lately however I've been finding various bits of food and spat out milkshake drink on my car in the morning, the occurances of which co-incide with visits from a teenage cousin who turns up in an old Peugeot 106 - This isn't that big a deal itself but I'm wondering how long it is until the culprit decides to "key" the car.

With this paranoia in mind I thought I could point a cctv camera at my car just in case but as it's on a public highway am I right in thinking it wouldn't be legal?