The most-traded June copper contract on the Shanghai Futures Exchange fell 0.9% to 71,660 yuan ($11,076.76) a tonne, after touching a 10-year peak of 73,060 yuan earlier in the session.
China, the United States and Europe showed expansion in their factory activities in December, signalling some economic recovery from coronavirus-induced slumps.
"Yet another decline for UK car production is of course concerning, but not nearly as concerning as the New Year nightmare facing the automotive industry if we do not get a Brexit deal that works for the sector," SMMT Chief Executive Mike Hawes said.