Greetings,
My thoughts exactly, I was sending a message but Phil's must have clashed somehow at the same time so mine got lost.
Battery off for a full 12 hour recharge and test; check cleanliness and security of all battery connections, leads to and from the solenoid, starter lead connection and engine earth. On more than one occasion I have actually fitted an extra earth lead from the engine to the frame to fix a similar problem on a different model of bike. Unlikely but check the sprag clutch too.
TTFN
Hugh.
Ps he's just done it again