The new BT Hub arrived (as did the TV decoder). GF took his magnetic frame down from the media cupboard and unclipped the relevant cables and the old hub. Then, with the help of the jigsaw, made a few minor mods to the peg-board then started to put everything back. Cable ties were tightened and snipped, the new hub was in place and switched on.
GF then went round all the various devices in the house resetting their WiFi settings. Everything is up and running again and with luck the Infinity service will commence on Tuesday and we'll be moved into the fast lane.