Limited info so far. 'Three will launch its first 5G network this August in London, before extending it to 25 other UK towns and cities before the end of the year.
After London it plans to launch in: Birmingham, Brighton, Bristol, Cardiff, Edinburgh, Glasgow, Leeds, Liverpool, Manchester, Nottingham, Sheffield and Sunderland before the end of the year.'
https://www.bbc.co.uk/news/technology-48582957