Question to the Home Office:
To ask the Secretary of State for the Home Department, with which countries the UK has a visa reciprocity agreement.
The current list of countries whose citizens require a visa to come to the UK is at Appendix 2 to Appendix V of the Immigration Rules.
The UK keeps its visa system under regular review. Decisions on changes are always taken considering a range of factors. These will vary globally, but often include security, compliance, returns, prosperity and can included reciprocal arrangements for UK nationals.