Your beautiful bike inspired me to search for one of these and now very excited to report that after a year's searching I just put payment down on a very lucky find....
Its a Team Champion originally purchased from Langsett cycles in Sheffield in 1980/81 which had bought it from an exhibition. The owner was told is was one of a limited edition built for the Motobecane Team and came with two chromed forks including the embossed 'M' version. The owner very shortly thereafter suffered a bad injury and stopped riding it. It has been in storage ever since - including emigrating to my side of the world with the rest of the household belongings at some point - and I tracked it down through word of mouth. It has the braze on FD and Cinelli BB. It is a real time capsule and still even has the original 1980's reflector set fitted. It is not overly clear on the photo but the Team Champion model text is on the top tube.
If that wasn't amazing enough it is also my size
My wife is a big Paul Sherwen fan and so this is one bike that is getting welcomed into the house with open arms. I will give it a good polish and post some pics when it arrives.