I've got 5 bikes insured with Peter James Insurance. 0121 506 6040. My third year with them, £127 fully comp with £50 excess. Worth a try?
http://www.peterjamesinsurance.co.uk/index.php/products/modern-motorcycles
WTF has happened to Ebike, my renewal came up and I couldn't get on the site to renew, I called them and they said to use the website and rung up.
I have three bikes covered with CN now but the other four the quote was high with CN, so I may give Peter James a call tomorrow.