depends on what you are doing...
when they came out to me, I was showing them the commissioning process of a combi boiler installation..
it is all about safety... safety and safety..
Electrically isolating the boiler..
They will want to see a gas tightness test.. dont forget to bring your leak detector spray..
Standing pressure
working pressure at boiler/meter
show them and do the process of rating the appliances
Using your FGA on the commissioning process..
Then a few questions of unsafe situations and what if.. scenarios
It should be fine,.. they are there to help and make sure your are doing thing safe and in accordance to manufacturer instructions/regs..
good luck.[/QUOT
everything above and also he will want to see you have all correct paperwork such as warning notices etc just incase.
the guy I got was fantastic as long as your safe and and dno your stuff he will be fine.