Navigator Travel Insurance
I'm an Australian living in UK, and went with www.navigatortravel.co.uk, paid £560 total for two people for a year, no excess. This insurance is designed for motorcycle touring, and this was specifically written into the policy document for riding on 1150. You may need to be UK resident, but check out the website as I am not sure of this.
Be aware that most insurance companies will not cover you when travelling to the country or region that is against government advice. We ended up purchasing an Air Rescue Card with Travel Assist Network (sorry, don't have the website details) who clarified that they would air evac us for any medical emergency including if it arised from motorcycling (excluding racing for sport), as well as getting us out of the country if it became too unstable, regardless of goverment advice providing the country had not declared war. There are other companies that offer this (including Medjet with link on this site somewhere), extra piece of mind for us but it is up to the individual on whether they think its necessary.