This programme was on BBC2 on Wednesday night, I missed it but caught the last few minutes. Looks like it was a good show, sorry I missed it
He had a Hornby train set (yes a proper train set, not a model railway). This seemed to be on a board only about three or three and a half feet wide by about eight feet long.
In N everything new in British outline requires at least 10.5 inch radius curves, so for a single track loop you need a minimum 23 inches. Continental stuff will happily make it round 7.5 inch radius curves (obviously these should be hidden) and also features impressive very close coupling, but it costs a lot.
Given that the Hornby stuff made it on what looks like a three foot wide board I might consider changing scales to OO get the benefit of improved running. I was thinking of On16.5 industrial outside. An experimental board of painted marine ply with a topping of 'insertion jointing' (used for insertion between concrete building sections) has been sitting outside for three or four years now and seems okay.
I should be settling down in the next few months - If I make wardrobes four feet high I can run the layout on top and use the 'wardrobes' to carry the return curves.
What does the group suggest is a realistic minimum radius for current (and future) OO scale..