Why would they need a new mould for the old 0-4-0 chassis though? They still seem to be making stuff from all the old moulds (CR Pug, GWR 101, King George V, Class 06, Bagnall diesel, the ex-clockwork Thomas, and now the unbranded Percy). Since they're aimed at an audience unconcerned with prototype accuracy, I don't see what a new model on the chassis would offer...