My BAA pass required 10 years and 2 references as well as complete work history for the period.
Think they had to have known you for minimum of 5 years too..
Both mine were/are respectable, reconisable members of the community and both were contacted and both had to confirm details in writing.
Think you will also find it is the responsiblity of the employing company to check the reference and sign a declaration that this has been done...