The layout now has a name - thanks to all who provided advice, suggestions and pointed out where some of the suggestions had previously been used. Given that the previous layout built here in Longreach was named Swallow Street (after the street where we live - and based on a track plan called Collier Street, Amity's maiden name) we decided this terminus should continue the theme and so Swallow's End.
Swallow's End is a quiet little village "somewhere in England". If it were GWR territory it would be yellow/blue code (I am not too up with the GWR colour coding but the 57xx in the Haresnape book I have are marked thus). I guess this gives a nominal axle load of around 18T for locomotives so I will work with that.
I have also negotiated a small extension. Instead of having cassette operation, I am going to build traverser tray which will hold the trains and be separate to the main board (bolted on for operation). This in effect will mean the previous entry/exit line will be moved 15 inches to the end of the board. At this stage I don't plan on changing the track plan by adding more space in the loop but I could - this will mean there is a bit more room for the points but the traverser will be fixed at a 0-6-0T, 7x 10' wagons and a 15' brake.
The signals are marked where I think they should be - as there is the possibility of a passenger train being locked in the platform while a freight comes in (or vice versa) I am assuming block control. Obviously, should such a branch stub survive Beeching, it may well have become a one engine in steam and eventually just the platform if close enough to a major urban centre to provide suburban traffic (similar to how St Alban's Abbey is now). With the extension, the home signals can be included rather than just the pair of starters. The positioning of the home signals provides the limit of shunt as well.