Would ye all stop???
The most important model to date, in my opinion, is IRM's P42 chassis.
Many of the models have been game-changers or catalysts, but because of P42, modellers everywhere lost their shit and bought up every single 071 that had been gathering dust on retailers shelves.
121's were lashed out of it because modellers were starved of locos to haul their P42 rakes.
Hopefully, there will be about three times as many A Class locos on offer as there were 121's, and that will bridge the gap to the next rolling stock.