A lot of people do refer to Red Oxide as Red Lead because it was the default safe substitute.Found this “
Red oxide, also called red lead, reacts with iron and iron oxides to form insoluble compounds called plumbates, in which lead is part of the anion, (PbO?)?². For instance, ferrous plumbate has the formula Fe(PbO?), in which the cation is Fe?².
Halfords must have a red oxide using different materials.
Not just Halfords, Rustoleum, Screwfix, Hammerite, all produce Red Oxide and they all
state their paint as lead free. Somehow I can't imagine they would take the risk of
telling porkies on this issue, could you? I hope not, at least since 1992 anyway!