James Lodge
Thanks Nick for your insight!
When it comes to Brent itself, there are notes on some of the turnouts being stated as 10ft old type (yard turnots) but my predicament is mainline. I am taking personal licencing and saying this is the case for most turnouts along the line.
When I get to Kingsbridge or Brent, that will need more research! Brent itself to 4mm scale could be around 6m long end to end (accounting for the inclusion of Up loop all the way through to down loop.
Kingsbridge being around 4m (If I plan to get to them that is…)
For now, my small make believe Brickworks near Dipford will do!