hi dudley,
it is quite an early design from keith, for Kennions, and no construction series. it uses LBSC's PANSY cylinder block and valve gear so you may like to consider modifying the valve gear to correct errors perpetuated by keith.
LBSC's PANSY was described in ME 1958/9.
later on keith described in ME (circa 1997) a much more true to scale and accurate 7.25"g GWR DEAN GOODS.
cheers,
julian