Without wanting to upset too many people the initials on the issued paperwork say BSSER- which for those who don't know are short for Boat Safety Scheme Examination Report, not a "pass certificate".
And the people who say the boat should have a bubble tester are not Gas Safe Registered to do a soundness test on a "liveaboard, residential" boat.
It is not a requirement to have one, but if one is fitted ( in the gas locker) a non Gas Safe examiner can do a soundness test on a "live aboard, residential boat.