The ADS agreement is an agreement between the UK and China allowing Chinese nationals to enter the UK with an approved tour group.
You must use VISIT - ADS Code 3 for a maximum period of 30 days and marked ‘single’ or ‘dual’ to indicate the number of entries to the UK for which it is valid.In most cases, the visa for ADS tourists will be valid for one entry to the UK during the period for which the visa is valid. However, in cases where the tour group’s itinerary involves onward travel to Europe and then the group plans to re-enter the UK dual entry visas should be issued.
