Question to the Home Office:

To ask the Secretary of State for the Home Department, which Commonwealth countries residents (a) need a visa and (b) do not need a visa to visit the UK for tourism purposes.

A list of countries and territories whose citizens and nationals need a visa prior to travel to the UK as visitors can be found in Appendix 2 to Appendix V of the Immigration Rules - https://www.gov.uk/guidance/immigration-rules/immigration-rules-appendix-v-visitor-rules.