Originally Posted by Red Herring

If it's a road bike post 1986 (I think, or about then) then it has to have indicators if it is required to comply with lighting regulations, ie: it has a front or rear position lamp. If on the other hand it is a bike designed or intended for off road use and only has a single seat (no pillion) then it is not required to have indicators. My local MOT tester takes a liberal view on the "off road use" clause and says that my track bike is clearly adapted for off road, ie: a race track, and lets me get away without indicators.