Problem solved.
BMW do not offer mudflaps for the LCI E91 Msport, only the SE and this is what a garage had installed for the car's previous owner (see my previous post).
However there are front mudflaps for the pre-LCI Msport (part No 82 16 0404 794) and having bought some , I can see no reason why they wont fit my LCI Msport. Will do it at the weekend.
Irritatingly
, the parts dept at my local BMW dealership didnt even mention that there are mudflaps available for the pre-LCI Msport- even when I showed them printouts of mjh93sa's car; leaving me to do all the searching. They may well have been unaware of this fact too, I suppose.
I thank mjh93sa for his 330 pics , as it was they that made me continue searching.