If you return to live in the UK permanently, (this includes the Philippines) your State Pension will be increased to current levels. If you subsequently move to a country where annual increases are not paid your pension will not increase in the future.
So if you leave Thailand for the Philippines you will receive the updated pension straight away, stay there for a 6 month 3 day holiday and then return to Thailand you will keep the updated pension, but not future increases.
Do this every few years and your laughing