UK Are Grommets necessary

[plugsandsparks]

Have always used them and they come into their own when you have a very busy light switch with multiple cables. As mentioned often the plaster holds the cable but its not certain. I go through hundreds of the things and get stressed when i cannot find one... lol

 

[richy3333]

The cables not double insulated. If he’s telling you that and missing off the use of grommets I’d wonder what other short cuts has he taken??