You asked

​​I am trying to find a definitive list of current UK cities (not towns). Wikipedia show such a list but they are not an acceptable source of such information. Do you have such a list?

We said

​Thank you for your request.

We do not hold a definitive listing of current cities in the UK, nor is aware of any such listing maintained by government.

ONS has however previously produced a listing of major towns and cities in England and Wales, focussing on the 'core' town or city rather than its surrounding area, using a population size threshold of 75,000. One result of this is that some smaller cities with official city status are excluded.

For further information on major towns and cities in England and Wales, please see: https://www.ons.gov.uk/aboutus/transparencyandgovernance/freedomofinformationfoi/townsandcitiesintheuk