Just did a price comparison on 'confused.com' for my wife's bike, she's been riding just over a year and has an Yamaha R6.
Surprisingly the cheapest quote was �79 from the AA as opposed to a renewal of �186 from Bennetts.
As with anything it's worth shopping around, an hour or so on line could save you hundreds.
I would start with Confused.com then try google for 'bike insurance' and go to some of the more spcialist companies (Bennetts, The Bike Insurer, Ebike etc.)
Good Luck.
Safe Riding.