Chris

So the sat finder insists you have a good signal from a well pointed dish?

If so I would normally then call into question the quality of your cabling work, but the Bush receiver not recognising your postcode is a worry. Have you tried any other postcodes to test the function? Don't enter letters and numbers at random, choose one you know exists.

The postcode list is built in to the box and should work even without any signal. If you establish that it is not working, that would be grounds for taking the box back for an exchange or refund.

It would also be worth getting your hands on another sat box, any will do, sky or Freesat, and testing your cables with it just to rule that out entirely. Can you ask a friendly neighbour?