Well, on our first day at home I decided to investigate the broken satellite system. I pulled the covers off the cable trunking and using the volt meter measured the voltage on the power cable. While doing this I discovered that the live wire to the satellite receiver was disconnected. It looks like it had never been fully connected and had possibly rattled its way loose during our drive. I reconnected the cable properly and behold, we have Cbeebies and other assorted rubbish on the TV. What a simple fix.
Now where did I leave that damned water filler cap?
Update: a visit to Southdowns Motorhomes Centre this week solved our water filler problem, we bought a new filler cap complete with keys for the sum of £15.22. Sorted.