The lifts were installed in 2006, as part of the Cascades Shopping Centre modernisation which completed in 2007.
The lifts are a set of 4, with one stand-alone in Spoon Portsmouth, serving from Ground Floor to 1st Floor to allow customers to get to the restaurant.
The sets of lifts can be quite dodgy and sometimes do go out of service for long periods of time, and there have been times where they've kept going out of service. I don't remember a time where its ever got stuck with passengers.
This is the stand-alone in Spoon.