WiFi Extenders...Just for Info: Very pleased with this purchased.
My FVP4000T is situated 25 metres from my BT Router. The 4K is however still picking up a reasonable signal but I decided to invest in a WiFi Extender.
Netgear WN3000RP £24.99 from Argos or Currys.
This is placed in Power Socket in the hallway midway between Router & 4K.
Using Netgear App (Android) the signal at the 4K now reads 90%.
Another possible option would have been (although a little more expensive.) the Devolo Mains Wifi Adapters.
graham uk