Come on man.. You need to do better. ????
Yes, the UK has a tax treaty with Thailand. It is called the Convention between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Kingdom of Thailand for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with respect to Taxes on Income1. It was signed on 18 February 1981 and entered into force on 20 November 19812. It is effective in Thailand from 1 January 1981 and in the UK from 1 January 1981 for Petroleum Tax, 1 April 1981 for Corporation Tax and development tax, and 6 April 1981 for Income Tax and Capital Gains Tax2. The treaty covers the taxes on income that are imposed by both countries, such as income tax, corporation tax, petroleum revenue tax, capital gains tax, etc1. The treaty aims to avoid double taxation and prevent fiscal evasion by providing rules for allocating taxing rights between the two countries and reducing tax rates1. You can find more information about the treaty and related documents on the GOV.UK website3 or here.