Se123,
I reviewed your posts and I am confused about what you do. On 2 March you were making wooden pallets and now you are asking about GLP
Anyway if you are in Malaysia surely you approached the Malaysia Ministry of Health and looked at links like:
The Malaysia monitoring authority for GLP
http://www.nccr.gov.my/index.cfm?menuid=4
The Malaysian principles of GLP, presumably the same as OECD guidelines.
http://www.nccr.gov.my/index.cfm?menuid=15
The model appears to be the same as elsewhere. The national government through its health agency sets up a monitoring authority who appoint inspectors and a group of approved labs is built up. You could call it accreditation.