Here are a couple of panoramas of the the HS2 Colne Valley Viaduct, that I took while doing my Birthday Challenge shot of a pier or jetty at Harefield Marina. This in the Denham ATZ, so I had obtained permission.
Although HS2 construction has been a pain for walking in the area, the viaduct does look impressive as it crosses the excitingly named Harefield No 2 Lake to Savay Lake via the Grand Union Canal. The Harefield Marina can also be seen.
Peter