I'm trying to place a light switch in a sensible place in a new room being built as part of an extension. I know that according to the building regulations, the switch must be at least 300 mm from any corner of a room. But what is "a corner?"
My room isn't rectangular shape and door opens essentially against the wall - see the diagram to get the general idea. I'd like to position the switch where red dot is. Yet it would be only about 80 mm from the end of that short wall. Is that allowed? If not, the only other option is to position it on the wall at the bottom of the diagram, beyond the width of the door, but that's very inconvenient, frankly.
So, it is allowed to put the switch on the left of the door in this case? And, by the way, what's the reasoning behind the 300 mm rule?
This is in the UK.
EDIT: Reading the Part M, it seems that I may be OK, as the document specifically states a minimum of 300mm (measured horizontally) from an inside corner. As in my case you could argue that it's not an inside corner, it may be allowed. Yet, I'd like somebody more familiar with this to confirm.