In the 1980s, I was given a guided tour of the basement of a building that I think was in Exchange Street. I seem to recall it was near to the underground car park on the left as you travel up from Dale street. In this basement were dozens of little Detention cells that were covered in white tiles. I think the guy showing me around thought they were from the days of the Slave trade but I doubt the buildings were old enough and there is doubt that Slaves were ever brought to Liverpool anyway. Has anyone heard of these little cells and what they were used for?