Thanks Mike.
I spoke at length with the CAA and am awaiting the confirmation in writing of what I was told verbally that as my initial IR was single crew ME Piston, that is what I need to renew rather than a multi-crew IR as you quite rightly mention.
The TBM doesn't have a type rating. For insurance purposes though it is a prequisite to complete a manufacturer's approved training course which is close to a type rating - 6 days of ground school and 6 days of sim. The only two places offering such courses are Daher-Socata themselves at Tarbes and SimCom.
The challenge I have is trying to establish whether I need to get the EASA SE Single Crew endorsement and if so, where from or does it form part of the course at Tarbes.