Discovery of old photographs including
this Flickr set,
this photo and
this photo have revealed more about Basingstoke new town's lighting history.
It seems that some of the oldest new town lighting consisted of 8m CU Highway X columns with Thorn Alpha 2 fluorescent lanterns, installed in the late 1960s. Following this, from the late 1960s to probably around the mid 1970s, 8m and 10m tubular steel columns were installed, and it seems that many of these were fitted with mercury-burning Thorn Alpha 3s. Roads like the ring road had Alpha 5s on the same style columns, and these were slimline bowled and possibly SLI. Meanwhile, the main road through the town centre had GEC Z8420 'turtles'.
Recent memories of Basingstoke main road lighting are of gear-shoed Philips MA90s and MA50s on 8m and 10m tubular steel columns. It appears that Basingstoke originally had a thing for main road mercury, and that by the 1980s the council decided to make energy savings by bulk replacing mercury with SOX. Meanwhile, CU Highway X columns in Basingstoke could recently be seen with gear-shoed MA90s, although on different style brackets to the fluorescents. The brackets looked to have been of the same vintage as the columns, so perhaps some concretes also had Alpha 3s.
Basingstoke may not have had the most elaborate new town lighting, but like the rest of Hampshire it was different to other towns in the county. The presence of lots of main road mercury was unusual for the county, and thanks to mass lantern replacements of the 1980s that affected the rest of Hampshire too and the current PFI, all that individuality is almost all lost now.