In the 009 world, it is fairly well known that if you want a decent outside framed 0-6-0 chassis, you buy the Graham Farish 08 chassis and then buy some valve gear for it, and Robert is your mother’s brother.
The problem with transferring that logic to standard gauge though is that the 08 chassis has a really short wheelbase which means that although it gives you an outside frame working chassis, there isn’t really much else apart from some dock shunters that you can model with it.
However, Hornby, wonderful people that they are, sell the wheel sets only for the 08 (Ultrascale do the EM and P4 versions too I am reliably informed). This means that within reason you can “drop in”* the 08 wheel sets into something else to give you an outside cranked chassis that you can fit dummy outside frames to.
I have a feeling that in future, this could be very useful.
The pictures show the wheel sets sitting on the double slip built by the Patriarch.
*Loosly describing the several hours long swearing session getting them into a chassis they were never designed for.