As an aside, at least on my mobile there doesn’t seem to be a site category drop-down on TMA for those who might want to explore a specific site type in the UK or elsewhere. Maybe I’m wrong and there is, maybe a useful add or un-necessary?

If you go to Sites at the top of the page, there is a filter by clicking on the red-labelled "Everything". This displays site types you can filter the country/county etc by.

Edited to expand in that: The three dots next to each site category reveals further sub-categories of sites you can filter by.