Hi. Are commercial certificates issued by the likes of station road steam and the steam workshop valid at a club. A friend and I were discussing this and we were completely unsure about the validity of them.
Here's a paragraph which may be relevant, from the 2018 test code:
12.6 Test Certificates which include repeat hydraulic test and steam test results issued by professional or commercial organisations are acceptable. It is not acceptable to mix a commercial hydraulic repeat test certificate with a Club or Society issued steam test certificate or vice versa.