I've just noticed that the "empty" address on Hornby's new R6302 D R Llewellyn PO wagon is "Windber Colliery, via Gadlys Junction, Aberdare, T.V.R.". According to Turton's second collection (p.81) the prototype of this wagon was built in June 1907.
Apart from the couplings (!) and the brake gear (which should be on one side only) this is a rather lovely representation of the wagon as shown in Turton.
Pity there aren't any suitable pre-grouping locomotives to pull this wagon in Hornby's catalogue.