@Philbert Moved the discs up, Wi Fi connection to PC in study now excellent. Originally Download speed was around 56 Mbps, see the change now in the latest test image.

@Alexandre. thanks for that never thought of wall mounting.

@kes32 Many thanks for your advice. Not possible to go the whole way on your recommendations but will certainly try some adjustment to improve the location of the 2nd Disc.

Please excuse what some might take as stupid question but I am 88 and have little i/t knowledge. I have just installed Deco M9 Plus Mesh system to my AC4000 router. Main disc is about 3 ft from floor...