He handed over to Rama VIII, King Bhumibol's elder brother, who died in 1946 after a mysterious shot to the head.

For one-time use, it would be easier to build the keyrings in a local temporary directory, generate and exchange the certificates, and then move the finished keyring files to their final destinations.

Television personality Heather Mills-McCartney, herself a beneficiary of blood transfusion following a serious accident in 1993, will preside over celebrations.