Turns out my neighbour's even more of an idiot than I originally thought. He'd set fire to his rather large evergreen hedge at the bottom of his garden after trying to burn weeds! I clocked the rather thick brown smoke out of my upstairs window and thought that looks rather close to the hedge!
I rushed down there with my 50ft hose and started dousing it where it joins my fence and my rather dried out overgrowth :?and I could see his Mum on the phone to the emergency services. They turned up about 5-10 minutes after where by this time it had eaten most of the way through his whole back border and into the side (About 25ft in total).
Although I was dousing my fence and garden a lot of me was really hoping it would take out the whole of the overgrowth

Sadly the wind wasn't blowing in the right direction. It would have been pretty epic mind
