PAT testing ceiling fan

[Liberator]

When PAT testing came across a ceiling fan with supply wiring protected by trunking, but out the end of the trunking is a short flex lead with a plug on it. They plug it in to a normal wall socket to operate the fan. I can inspect the plug and the small portion of flex outside the trunking, but cannot safely attach test lead to the fan to check earth bonding, or inspect the rest of the flex hidden inside the trunking.

Should I inform customer am unable to test?
Does this setup conform with regs?
Should I recommend that he gets the fan properly connected to the installation?

Take a one-gang extension, test it and record its values (say its 20feet long, with an Earth Continuity of 0.12 Ohms)...... then plug the 1G into your PAT tester and the socket end gets connected to your plug for the Fan.

Whatever earth reading you get, subtract 0.12 Ohms from it. Obviously do all of your visuals first, and re: trunking I would just remove the capping if thats possible to have a look.