Was looking for a powerline for the loft. looked at the option of ethernet but found this in local tesco (ashford hospital middlesex) Pretty sure this is national. I bought last one. Reduced to clear. They also stock the Ethernet kit, which has 2 powerline adapters av500 for £19.
TP-LINK AV500 300Mbps wifi & 500 Mbps powerline TL-WPA4220KIT £30 TESCO Instore (Ashford Hosp, Middlesex)