Thought I'd be clever and use a local BM 'specialist' for last service. Big mistake - expensive and crap + I now find they didn't refit the undertray. So I need one. Can get an aftermarket one on fleabay but rather have OE. Time for a plug for BMWman in Heanor who I (and a few members) now use. They are very good. Fair, straight and really know their stuff. Highly recommended.
So if you've got an undertray please let me know. Cheers.