Bossington was exhibited at the Model Railway Club's forty third exhibition in 1968, at the Royal Horticultural Hall. The track layout is in the layout section of that handbook (two shillings since you ask). I remember viewing it; it ran well, had a taped commentary and, I believe, offered a vision of a workable layout at an affordable cost for a new modeller.
I am currently attempting to build a similar layout based of a Metropolitan/District Railway flavour. I have purchased old Graham Farish Liveway to recreate it and the board is around 8' by 1'4". Incidentally, the other end is based on The Minories by C J Freezer.
I think one essential of tbe original layout was 5he smooth operation which was achieved by good track cleaning. I hope that, should I live long enough to enable the project, the combination of live frogs and good track cleaning will give me great operation.