Success!
I adjusted the Satellite Dish to something closer to the other 2 on the building; and, after fine-tuning, found an even stronger signal on the meter.
And, Hay Presto, I straight away got a good picture on the Television.
I am very grateful for the comments on this thread, Thank you.
Only slight disappointment is that there is no (UK) Channel 4 or Channel 5; though there is Film 4. Is this correct?
Now I'm getting the hang of it, is there another Satellite I can receive that does have Channel 4 and 5?