Can someone who has done a certificate course at a district technical
school say bricklaying or laboratory work write after their name John
Smith BL(name of district) or John Smith ACLP(district)... a certificate
laboratory procedure?
Are Universities the only educational providers that can award a
qualification suffex and if not, where is the line drawn and by whom?

A new Indian restaurant opened near me and the manager gave me his
card. I was impressed.

His name was given followed by MA and his position shown as Managing Director.

Here in the UK, 'MA' means Master of Arts so I asked him what it stood for.

He said 'Manager of Admnistration'.

I have seen quite obscure qualifications listed after someone's name.

I've never listed my (real) professional qualification after my name. Who cares?