In reply to Kevin (north east & spain):
Bike theft is largely a few blokes in a van picking it up, locks and all, and throwing it in the back. Not quite gone in 60s but not far off. London does have the moped gangs but little reported elsewhere in the country. I've toured around the UK using pelicase panniers with cable locks around them. Helmet locked onto bike with another cable lock. Never had any problems just a few friendly folk wondering about life touring on the bike.
All that said I ride an old man's bike now. I'd perhaps be hesitant if I still had the R6 but that wasn't the best bike for touring!