The vaccines reduce the incidence rate for severe COVID.

The UK has one of the highest vaccination rates and once almost everyone has been vaccinated, the rate of vaccination will slow down, because there is hardly anyone else left to do.
Also, the Westminster government is in the process of demonstrating how to deal with COVID in 2022. Almost no restrictions and rely on vaccines to keep the hospitalisation rate down. Numbers with COVID are already falling, so the policy is working..

The Thai government is still stuck with a mindset suitable for COVID in 2020. I guess they will catch up eventually.