Well Thank you it took me ages to find it but here it is Older models do not have the flexibility of more modern body tooling, offering slide options for chimneys, domes, cabs etc. They were produced as one type and one type they remain and it is totally uneconomic to scrap perfectly good tooling on the basis that it cannot offer an alternative chimney style. Alternative fittings are available from other suppliers for modellers who wish for a bespoke locomotive for their layouts.
We did replace both the Standard Class 4MT 4-6-0 and the Jubilee 4-6-0 with entirely new models and, taking into account the tens of thousands of these already in circulation, sales of both of these have been no different to, had they just received a chassis upgrade, such as those on the A4, B1 and V2. Hence, the decisions we have taken to upgrade chassis only; allowing valuable production slots to be better utilised by bringing totally new models on to the market place. So same body