does a doorsupervison certificate expired?
The SIA licence is valid for 3 years, I do not believe there is an expiry date on training certificates however if you have not applied for your licence and your certificate was awarded before sept 2010 you may need to sit further training in the common module and the PI module. It would depend on your previous course. If you are renewing your licence then your current qualification will be valid. The SIA have not introduced PI as mandatory on renewals.