This one with free shipping and 17 quid less.
1/87 Ho Scale Train 50cm Track Model Accessories Train Treadmill Track Bearing Train Roller Test Stand With 8 Rollers Kids Gifts - AliExpress
Woking Pre Assembly Depot was mostly built on loco ash. Once a month or so the local fire brigade would turn up and spend a few hours hosing the ground down, as deep underneath it was still smouldering and that was back in the late 70's early 80's.