Only two, oh no there's more than that! 'British Railways - Past & Present - East Cornwall' by David Mitchell (a friend of mine) has a shot of the 1971 open day (1-5-71) with 1363 on the turntable. In the background can be seen 806 'Cambrian' and in the shed, 854 'Tiger'. So that's a class 42 and a class 43 Warship in the same picture. It also shows the coaling stage in the process of demolition, the water tank having already been removed. I thought it was quite late when this was demolished as the Bernard Mills picture (1969) was taken from that point.
Also worth noting is that prior to 1974, there were no 'clay-hoods' as these wagons were simply sheeted when loaded and open when empty. I have some photos as late as 1980 with sheeted wagons, indicating the time span over witch they were introduced. The variety of wagons and vans was quite extensive, although the colour was bauxite, under a covering of clay dust.