Good morning,
I believe the model you are seeking was built by David Lloyd, who was the first editor of Continental Modeller magazine, published by Peco.
There is a picture of the locomotive on page 60 of “The Modeller Book of Narrow Gauge”, published in 1986. The caption says David built the 4-8-0 in 1960, then it passed to Michael Taylor, but in 1986 she resides in the L&LSR Boardroom.
It would be nice to see some up to date photos if she can be located.
Paul