Don't believe the bike insurer.
Comparision websites are generally good from my experience apart from my experience today.
Quoted £401, Falcon Bikes, 2003 749, Im 29 Passed my test 2 years ago but not ridden in between. When I try to actually buy the policy though I have to call them with a reference. Apparently even if you put you have no NCB it assumes you have been riding and not completing policies, so when I phone them the actual price will be £550.
However my second best quote of £440 with H and R was fine and I can buy online so I'm not too peeved. However this could seriously affect some people as I've put a deposit on the bike assuming the insurance was £401.
Moral of the story. Nothing is guaranteed until you have the policy!