What must suppliers in Great Britain do when a substance is added to the UK SVHC Candidate List?
TL;DR When a substance is added to the UK REACH Candidate List, supplier duties start that day: there is no transition period and no fixed publication schedule. A listing is not a ban. It obliges suppliers to communicate the substance's presence, and above 0.1% w/w in an article, to pass information down the supply chain and answer consumer requests within 45 days. The real work is proving whether the substance is in your supply chain.