In the 70's I worked in Northampton and regularly visited Bassett-Lowke's shop -
I recall a simple catalogue of A4 black & white photocopied pages held together by a staple in the top corner
containing model boat plans, but sadly cannot find it !
'Gwen Eagle' was another lovely cabin cruiser in their range.
My interest in Lady Barbara was sparked after seeing the model perform at a steam boat gathering held at the Steam Boat museum in Bowness Windermere,
another featured in Model Boats magazine around the same time powered by a single Stuart 10 driving twin prop shafts,
designed by John Langsford, he'd also designed another 'Lady ?????' cabin cruiser super structure (minus funnel) on the same hull.
Some info online -
https://solidwoodmodelyacht.com/en/model_boat_bassett_lowke_john_langford_design_electric_power_1950s.php