Foxdown

My OH is in the first stages of putting together his Vetassess Trade Evidence Form for plumbing. Has anyone got any tips on what to include or leave out? He has written some stuff but as I don't know how to dig a trench or fit a boiler I don't know if he has written the right sort of thing. I'd like to make sure he's heading in the right direction. Any tips or suggestions gratefully received. Thanks