The Bluebell Railway is a preserved, or heritage, railway that runs between Sheffield Park and East Grinstead, Sussex, UK., and is run mainly by volunteers. This ex-SECR locomotive, built in 1910, was the first locomotive to be acquired by the railway. That was in 1960. It was given a new paintjob and named "Bluebell" (what else?) and since then has travelled 78,000 miles in service. It was retired on 9 February 2019 but is still on static display in the shed at the Sheffield Park end of the line.
The kit was published by Peacock Paperkits, Tunbridge Wells, 1972. Scale is 8mm:1 ft, which seems a strange combination. It looks to be about O gauge. Building wasn't as difficult as I feared when first having a look at the parts and instructions; several placement issues are left to your own judgement (not a lot of which I have these days). But we won through!
The model was built as a Christmas present for a friend who works iin the Bluebell Railway office. She loves it.
Lots of info about the railway can be found here:
The Bluebell Railway in Sussex | A heritage steam railway