I really just wanted to know what was the best practice regarding installation of metal worktops. Maybe I should have been more precise in the wording of my question.
While PA testing a couple of holiday lets I noticed that the stainless steel kitchen worktops were not earth bonded and wondered if they should be. All the workshops, commercial kitchens I've come across have had bonded worktops/benches. Thanks.
WRT the flex you can compare its diameter with some known samples and base your compensation on the one that looks nearest in diameter.
Is the metal stand actually bonded or is the parallel earth literally through the floor? If the former you could try undoing the bond - although admittedly...
Definitely a fake fuse, as already stated there should be a sand filler. You could report that to Electrical Safety First, they are taking an interest in dodgy Amazon stuff https://www.electricalsafetyfirst.org.uk/