We’ve recently stopped giving out free data, and SIM cards at the centre, but are now able to recommend o2 and other databank providers in the city.
The easiest way to get a free SIM loaded with data is to read about it here -
https://www.o2.co.uk/national-databank-t-cs
you’ll find o2 stores in the town centre.
When the capacity allows us, we’ll be giving SIMs out at the centre again, but for now o2 stores and other databank providers are available in the city.