Have they changed?
https://www.gov.uk/foreign-travel-advic … quirements
If you wish to enter Cambodia you will need to:
get a visa before arrival — the visa exemption policy, visa on arrival and e-visa arrangements are suspended indefinitely
get a medical certificate, no longer than 72 hours prior to the date of travel, from a competent health authority stating you do not have COVID-19
have proof of insurance that includes a minimum of US$50,000 for medical cover...this is one I do not understand and neither do insurers in Canada (Vancouver)