Lawyers/notary public in London were quoting over £80 for certifying a document.
I believe the post office offer the same service and even more authentic because its a public entity.

I've posted the application using post office certification. We update on the outcome when decision is made.

Has anyone had experience with using post office to certify true copy of passport for application for entry clearance visa for spouse of s settled person in the UK?
I'm not sure whether to use Notary Public (expensive), solicitor or post office (affordable).

Please advise.