If the law says it is OK, and you believe you know your daughter well enough, then I would go with it. I know you say your village is full of busybodies, and that she is a bit of a 'geek' but isn't there anyone she could sleepover with if it is only 2 nights a month? Or a neighbour who would look in on her when she goes to bed? It is only 2 evenings a month after all and during this time she will be getting older and more responsible etc. As far as the busybodies go, if it was every evening then they may have a right to get involved but they may not even notice 2 nights a month, unless they really have nothing better to do than twitch their cirtains! Good luck to you. Personally though, I refuse to leave my 16 year old stepson on his own for a night but he is a completely different kettle of fish, believe me. Oh to have a 13 year old 'geek' instead!