Just a few bits of further info.
If you go into Priorslee Village itself a section of rail that would have gone to Lawn Colliery was embedded into the new road surface as a 'feature' by the builders, and some of the route of the line can be seen as a footpath between the houses.
If you follow the footpath onto Stafford Park Industrial Estate from the bridge over the M54 and then take the left turning which runs alongside Inchcape garage the route of the line to Stafford colliery can be discerned as a low embankment.
A strange survival, which I would love to know an answer to, is how the Ayrshire Railway Preservation Trust at Dunaskin, near Dalmellington have one, possibly two, very derelict wooden framed 7 plank PO wagons lettered for Lilleshall. They also have at least one other wagon lettered for the Shrewsbury Co-op.
Sandy