I've just noticed on my insurance policy that my bike isn't covered if it isn't locked, no matter where it is.

I'm assuming that a Thatcham approved lock would be best and the easiest to use seems to be a disc lock.

I just wondered if the alarmed ones were any good or do they keep going off all the time? I figure it would stop me driving off with it still on though.

Any suggestion for the best type of locks, preferably under fifty quid?