What is the EWC code for mixed metals?

The EWC code for mixed metals is 17 04 07 if it comes from a building or demolition job: pipework, brackets, radiators, scrap from a strip-out. Metal collected separately from a shop, office or similar premises is 20 01 40, "metals", and cans and tins are packaging, 15 01 04, "metallic packaging". Iron and steel on their own from a site are 17 04 05, and cables are 17 04 11. All of these are non-hazardous and go on an ordinary waste transfer note. Metal with oil, paint or chemical residue on it may fall under a hazardous entry instead, so describe what it is on the note, not only what it is made of.