ok so checked in with BMW this morning and two things stand out to me.
The description of part 11227561765 is 'Flywheel' and it costs £233.34 from BMW, the dealer print out shows the description as 'Flywheel/Twin Mass Flywheel'
I therefore do suspect that my car does NOT have a dual mass flywheel, the price is way cheaper than a dual mass flywheel would be and i suspect they use a generic title and picture for the flywheel.
Going to ask for a photo of my flywheel since it will be exposed anyhow, but i suspect i have a single mas flywheel. The chap at BMW (different branch) said they haven't sold any of these, but they do for the cooper S.