@chacho_2me
Not sure if this is of any use?
O2's 5G network is live in Aberdeen, Ashford, Banstead, Basildon, Belfast, Birmingham, Bradford, Brighton, Bristol, Cardiff, Chatham, Chesterfield, Coventry, Dartford, Derby, Dundee, Eastbourne, Edinburgh, Esher, Gateshead, Gillingham, Glasgow, Grays, Hemel Hempstead, Huddersfield, Hull, Leeds, Leicester, Lisburn, Liverpool, London, Lowestoft, Luton, Manchester, Mansfield, Middlesbrough, Newcastle Upon Tyne, Newtownabbey, North Shields, Northampton, Norwich, Nottingham, Oxford, Peterborough, Plymouth, Rainham, Redhill, Rotherham, Sheffield, Slough, South Shields, Stoke-on-Trent, Sunbury, Sunderland, Thundersley, Warrington, Weybridge, Windsor, Worthing and York.
The O2 Arena in London and Twickenham Stadium also have O2's 5G coverage. There are still more places for O2 to turn on 5G though.The company has confirmed previously it plans to cover other locations, including Milton Keynes, in the future.
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Also note that although 5G officially arrived in the UK at the end of May 2019 – through EE and Vodafone initially offering 5G plans - all the four major networks now offer 5G in selected areas although coverage is also not widespread just yet.