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Thankyou for your suggestions so far!! I should have mentioned that my house is listed, so I have to get planning permission if I want to do anything to the front of it. It took a year and a half to get the railings!! The Post Office next door had to get a metal gate to go on their entrance cos the kids were putting broken glass and LIT fags through their letter box. Trust me, the kids in this area are really not nice at all.
If I put a window box on the sill I can guarantee that it would be robbed/turned over/broken/thrown in the street on the first day. We can't even have wheelie bins or green boxes, or milk from a milkman!!
I like the idea of the alarms. I'll ask the police. I also like the dog poo idea, but I KNOW that if I put it on there, it will only deter them until it dries up, so I will have to have a continual supply. plus if they think I have done it to stop them, they wil put it through my letter box or smear it all over the front of my house.
I would never invite me- the polite approach doesn't work. They are too suspicious. Plus I am a teacher so they would report me for being a paedophile. These kids know their rights!! They got the Art technician at school the sack by making up stories about him- it was SO sad.
Keep any ideas coming if you have them! THANKS!