@Leo ******
How long a IDP is valid for depends on which IDP, which country you are using it in and your own national driving licence. If your own licence expires or is canceled, your IDP had no validity. For the UK, that includes the photocard, do it dies with the photocard. 1949 IDP has 1 year on it. Thailand moved to 1968 IDP which is 3 years or whenever your own licence expires, which ever comes first. There is also a 1926 IDP which you need for Brazil. Thailand and Vietnam are both 1968 IDP but Cambodia and Laos are 1949 IDP. So travelling in all 4 needs 2 idps. It's an abuse to misuse multiple IDPs to "extend" driving in a country. The clock starts when you arrive nit when you start driving.