I don't own a rotorway or a r22, come to that, however, as I understand it, the newer drives from rw, dont break, with the chain drive, which is supplied with the rw kits, the problems seem to be, based around "alterations" made to the standard, and quite rightly stated, the CAA will NOT allow any NON standard, items to be fitted to a UK rotorway,
As I previously mentioned, much more can be found out on the UK RW site
http://www.rotorway.org.uk/
the UK RW guru Ivan I'm sure will answer any questions