Hello I am a solicitor with over 15 years experience. I will try to help you with this.
When land is used in such a way that it causes a substantial and unreasonable interference with another person's land or his use or enjoyment of that land, there may be a legal nuisance caused. There may also be negligence. Nuisance and negligence or both torts (legal wrongs) which can form the basis of a legal action seeking compensation and in some circumstances orders requiring particular action to be taken by the wrong doer to end the harm being caused. I doubt in these circumstances that an injunction would be granted It is likely however that these particular circumstances would give rise to only a low value claim, wiht some doubts about the likelihood of success. The only legal action you could credibly make would be to bring a small claim seeking compensation for the inconvenience. Do you know if any of your neighbours are similarly affected or is it only you? In the circumstances you might think that politely reminding the head teacher of his promise might be the best thing to do.
I am afraid to say this is the most useless answere I could ever have expected, it was not a question of money it was a question of how to stop the light illuminating our bedroom all night, I have been nothing but polite and it has got me nowere as has your answere to my problem and a total waste of money.
I wanted to know if there was a law about having a light shining in your niehbours house all night causing them to loose sleep or agrevation, I do not whant any monies of them I whant the light sittuation sorting out and for the school not to ignore my plea.
No there is no such law which is why I wrote about the possible legal actions you could possibly bring and use to try to back up requests and or negotiations with the school. If there are other people with the same problem you should get together to talk to the school