Noticed this in Edinburgh too, specifically around the Southside and out past Craigmillar. Went from maybe two visible installations to what looks like six or seven in about 18 months. I've been photographing them since 2021 and the clustering patterns are weird - not evenly distributed like you'd expect from a purely commercial rollout.
Thing is, I've been down the technical rabbit hole on this and the frequencies involved don't actually require that density of infrastructure for standard 5G coverage. So what's the extra capacity for? Nobody from any of the providers will give a straight answer, just boilerplate PR responses about "improved urban connectivity."
Anyone else keeping a local log of new installations? Dates, coordinates, proximity to population centres. If enough people are tracking this properly across different cities we might start seeing a pattern that's harder to dismiss.
Drop your locations and rough timelines if you've got them.