Having spent time talking to people using the park or living in the flats around the outside it's clear that possibly 95% of them have no idea that the tower is open, let alone that tours are available. Perhaps it's got something to do with the lack of info on the boards around the park?
Caledonian Clocktower and Park, September 2019
This board on the north side tells us that the tower is being renovated, will open soon and to watch this board for updates.Er? Also see the big empty space where updates could be easily inserted. It ain't rocket science.
Find out more about the tours here.