Drop in speed using WiFi. Does a powerline solve t...

Upgraded to Infinity 2. Plug my laptop into the hub using the ethernet cable. Speed 55M.
Remove the cable and use WiFi, speed drops to 35. Laptop 10 metres away from hub (although the result is the same if I take the laptop to within a foot of the hub)
Done all the necessary to make sure it's on the best channel etc.
Does the purchase and use of a pair of Powerline adaptors (ie plug the hub into the power socket using an ethernet cable and the laptop into another power plug..on the same circuit..using another cable) effectively mean that I should then get the 55M speed?
Any advice will help. Keep it as non technical as possible, please.

There are a couple of pages with information about wireless, and network connections, which have some sample diagrams.
Wireless connection problems
Network connection problems and possible solutions
Powerline adapters normally work quite well.
There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.

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