Thanks for all the positive comments. They encourage me for the next layout, along the lines of:
Glen A wrote:Build another module to go on that end, and extend the railway with the bins relocated
but starting afresh rather than reusing Smith's dream. And either a landing for materials for a dam or a steam tram seaside line.
I'm being inspired by Chris Nevard http://www.nevard.com/
and in particular his Catcot http://www.flickr.com/photos/nevardmedia/collections/72157626123658415/
- about 1.5 m long and probably 4 mm scale, which I think looks great.