Posted: 24/05/2015 at 11:47
I have a Concorde pear planted 3 years ago as a maiden whip which is being trained as an espalier. I'm amazed that you have had fruit in earlier years. This is the first year mine has had blossom and I have picked off the fruit buds as I don't want to over-tax the plant while it's so young.
They used to say that 'You plant pears for your heirs' meaning that they usually take a good while to reach maturity and to crop well. Of course, with grafting onto rootstocks that limit growth, they reach maturity sooner now, but if your pear has put on a lot of growth I would imagine that it can't produce fruit as well and has sacrificed the crop in favour of growth.
Another thought is that it might be thirsty - the foot of a south-facing wall can a very dry place and we've had a remarkably dry spring (at least here in Norfolk). That would also have stressed the tree.