I've only just got round to giving this another go as I've been away all week. Unfortunately im getting almost identical results as before. It doesn't seem to matter where I put the decos, the speed...

@Alexandre. thank you for your detailed response and for marking up the floor plans for me. I'll give this a go and will post the results!

Hello, I have the hub 4.0 from Virgin Media and regularly get 350mbps download speed. There are however black spots in my house where wifi connection goes from 3 bars to 2/1 bar, so I decided to...