Stange how they quote, "FIRE SAFETY Complies with Amendment 3 of The Institution of Engineering and Technology New Wiring Regulations" but then at 0:56 he has forgotten to use grommets in the knockout holes..
https://www.youtube.com/watch?v=x9QAXfVTAVk&feature=youtu.be
Screws do look good though!
Clive