BMW assist recovery to dealers today. Not a known problem with conti trail attack according to dealer Also same confirmed by local tyre dealer who was concerned that he has supplied a lot of these tyres. Lucky old me to be the one with the problem ! Also £251 for new pr3's fitted but thought I should go through a dealer investigation - may establish some goodwill for future problems, alert riders/ BMW to a potential safety issue, and can afford to be without the bike for now. will update outcome in due course.