Posted: 27/03/2013 at 12:20
What is in your neighbours gardens? I ask because you will need at least one other different compatible apple or pear variety to pollinate your own for best results. Few are reliably self-fertile. More info here http://www.ashridgetrees.co.uk/Buying-Apple-Trees As they say on the Beeb "other supplier are available".
Crab apple trees will pollinate most apples and as they are chosen more for their blossom rather than fruit they are very common.
If there are no suitable trees around you one solution would be to try one of those "family tree" trees.
Pear trees usually take longer to fruit so you would need to be patient.