Hi,
As far as I know, Advance Passenger Information only applies to the USA.
This has recently got stricter under the new ESTA rules, with all passengers without Visa's needing pre-clearance at least 72-hours before travel to the States.
Thailand doesn't require this information in advance.
I am assuming you are staying in Thailand less than 30 days, and travelling on a British or Irish Passport, which is valid for more than 6 months from date of entry, so no pre-arranged Visa is needed. If this is not correct check the Thai Visa rules from your local Thai Embassy.
Regards, Graham