hi you could do worse than checkout
http://www.adventureridingacademy.co...S(1511375).htm they do have days where you can use your own bike, im not sure, if i was starting out i would certainly use a smaller lighter machine to learn some techniques on then work my way up to the bigger stuff. thier repair problem too!
they also do support at the british rally rounds
give patsy or clive a ring to see whats available don't just rely on the website as they have plenty on and unfortunately neglect to keep it updated! tell them i sent you!
bernard