I've updated the kmz file to the latest version. This includes a few more user submitted sites and I've now trawled the more accessible online county HERs and added any sites that were not included in the original project. Notably, many more sites on the Taunton stop line and around the Tyne and Wear area. I also found Geograph was a very useful resource for finding new and positioning old sites so there is now a section for these with links to the relevant Geograph page. Finally with new imagery in Scotland I've corrected the positions of many of the scottish sites.