Following the other threads on smoking, pollution, fines and the law, I wonder how long it will be before some little soul in Westminster finishes sharpening his pencil and legislates against it. It is quite possible you know, bbq's are very popular at this time of year and I would imagine a fair amount of dosh could be raised fining folks for having fun. ::)
Seriously though, I do sympathise with you as I have been on the receiving end of a pyromaniac neighbour and it was no fun as it almost came to blows. My house stunk of burning grass (no.. not that grass) and there appeared to be little I could do about it other than re-arrange the fellows looks
but the women got between us.
I can't for the life of me think there is any law which prohibits this form of pollution and a private summons for damages would be hard to bring. It rather looks like you may have to put up with it and pray for rain.
Perhaps on of our band has some experience in law and could comment on this one.