I'm sure Rotax (based in Austria) do run engineer courses. From memory the Diamond distributor was based at Gamston airfield.
Both Rotaxes I have owned have been in Europa aircraft. They were the 912 U/L versio which is non-certified, and available for use in permit aircraft and microlights.
Conrad Beale is recomended for engineering work on the 912 U/L ( and indeed the 912s and 914 versions). His father, Nigel, runs Skydrive- the Rotax agent for the UK ( and Eire and Iceland apparently !)
www.skydrive.co.uk
Hope this is of some help
FlyingApe