Since I complained about Mastery, it's kinda started working. I finally got it to record 120mph in the HST on GWE. It records my BR Heavy Freight, my Peninsula Corridor, etc.
I might give the HST a go again. I only tried about 2 weeks ago and it didn't work. It tracks the 166 stats but not the HST speed.
I just tried a short (Paddington to North Pole Depot) and a long (Reading to Paddington) HST service and neither has tracked on Mastery, so no change for me. They said that they weren't looking at fixing it until after the xmas break so I wouldn't expect any changes imminently. May I suggest giving your posts more useful titles in future - if people are just checking the New Posts page, it's handy to have some idea what the posts are about from the list view before they click