Your comments

Hi, Shaun,

Thank you so much for your very detailed reply.

I'm afraid your rewiring suggestions are a bit beyond my understanding and ability to implement myself; but I might make some inquiries to see if there's a local electrician who could do this.

My laptop and external monitor both have transformers on the power cords, so I'm not sure that these could be swapped out for shielded cords.

What is the difference in purpose/usage of 14-, 16- and 18-gauge cords?