Here are some pics from a bit of a walkaround yesterday
Pic 1 - in the main chamber by the FTTC cabinet (Huawei cab installed by BDUK funding April 2014) and associated telephone cab with G.Fast pod (added in approximately September 2018)
Approximate co-ordinates - 51.950418147036, -2.0730838519977617 - Street view image is from 2011 so you won't see the FTTC cab or G.Fast pod. The FTTC cab is on the grass opposite the telephone cab
Pic 2 - BT branded covers in pavement with green writing on
Pic 3 - More BT branded covers - from what I noticed yesterday, the numbers are sequential in the direction that the cable run probably goes in to the cabinet - however, not every cover has a painted number on as some are missed out. So i followed a route that had 205, 206, 207, 208 etc. yesterday. The entire area from these photos has their telephone supplied by underground ducts and was built in the early-mid 1990s, however, there are one or two older properties scattered around within a half mile radius that are served by overhead lines.
It is weird, however, that in every street the markings are only on one side of the covers on the pavement even though there are houses on both sides with covers outside. I know that there is BT equipment and joints in the side that doesn't have markings, however, as I've seen inside the BT branded cover that is outside my house (which is on the side of the road with no markings on) when I had an engineer visit to fix a fault a few years back. I can't find a picture of something similar, but inside the BT branded cover outside my house there are is fairly large cable which runs in to a black plastic housing that is about a foot long (iirc) that is shaped a bit like a bell jar and the cable also continues to the next cover a little further down the road.
There are also some covers with additional code next to the number - but as I am limited to 3 images per post that is coming up in the next post....