I'm pretty sure that the owner (Dave?) "aged out" of the hobby. He was really great to deal with. I tried the phone number a few months ago and it was no longer in service. There is a Facebook page, but it hasn't been updated since 2012.
If you search the forum for "Brummy" there are a few threads from 2019 which include posts saying that the owner was in a nursing home. Unfortunately, the person who posted that information hasn't been on the forum since 2019.
I hope that someone picked it up. It sounds like Scenic Express may have a similar product.