I bought one of the new Rapid GWR/BR 15XX shunters from Rails of Sheffield. When it arrived it ran but when I set up a circle of track to run it in, it wouldn't go. An exchange of e-mails with Rails and they agreed to take it back. They even sent me a prepaid label. After a week or so, a parcel arrived and I had the loco back in full working order. Hence the next step was to run it in.
I bought the circle of track from a trader at the Milton Keynes show - at a cost of £40 - because I had hunted high and low for my rolling road but couldn't find it any where. When setting up a drawer unit that my wife gave me to store my railway stuff - lo and behold - there was the rolling road but pushed right to the back of the drawer. I sold the circle of track to Rails in a bunch of stuff that I no longer needed.
Here is the 15XX on the rolling road being run in. It is a lovely little loco. The Walchaerts valve gear is especially nice. Note the firebox glow.