Thanks for that MJ - I did mean to update the board on this one.
It seems to be working fine now (touch wood!) I was out last night and no noise whatsoever on take off (I didn't give it the full beans though)
Maybe it was just settling down? I cleaned the metal surface faces with meths as directed by others and I don't recall feeling anything untoward.
Saying that, my new air filter, spark plug and oli filter has arrived, so next time the weather's a bit rotten, I might just spend a day in the shed with the bike, my radio and a thermos of coffee and check it over again while installing my service parts.
Thanks again!