(All 14.8.2008 copyright Steve Sainsbury/Rail Thing)
My garden used to back onto the grounds at Longleat when I lived in Wiltshire. Back in 2008 I visited and photographed the miniature railway there.
It was (and still is) a 15 inch gauge line with excellent infrastructure, rolling stock and permanent way. It's about a mile long, with one main station and a route that takes you through the woods, back along the lake and into the main station again.
The line is generally always busy as it is one of the 'free' attractions once you've paid the entry charge.
All in all a lovely example of a line that almost borders on narrow gauge in the Heywood style. It would be great if the line was extended to actually serve a transport need through the estate, as well as offering a pleasant ride!