Sky SR101/SR102 Hub Power Supply Box

Sky, in their wisdom decided to put the step down electronics from 230VAC to 5VDC inside the Sky Hub box, instead of the usual way and used a plug mounted AC adaptor. This has the effect that EMF from the mains adaptor board, interferes with the WiFi electronics hence causing drop outs and poor WiFi range. Also they didn't help themselves with poor quality antennas.
This box supports the mains board external to the Hub, and I've designed it around using a USB A to B lead as the connection from