Fruit ID wanted - crab apples?

[BigShot]

How do folks?
Another "have I got this right?" post from me here.

Today I picked up 4.2 kg (about 9¼ lbs) of what I think are crab apples. The fruit are a bit pear shaped and have quite a bitter aftertaste.

Any verdicts? Crab apples or something else useful (or not)?

 

[gregorach]

They look too big to be "proper" crab apples - they're probably wildings (cultivars that have gone feral and interbred with wild trees) of some kind. Or they could be perry pears...

 

[Toddy]

They look like slightly under ripe wild pears to me.
There's a tree near us that produces masses of these small fruits. Excellent to cook with.

cheers,
Toddy

 

[BigShot]

They are in the 1¼" to 2" range.
I'd be surprised if they were wild trees. They are in that regular one-every-50-yards-or-so pattern of planting you find in housing estates. Planted in this manner. http://images.google.co.uk/imgres?i...s?q=housing+estate+trees&gbv=2&hl=en&safe=off along with several other species of tree, the one I recognised immediately was Silver Birch, but there were others too.
I suppose they could be a "wild" variety, but they almost certainly didn't grow wild. They follow the line of the kerb throughout the estate.

Here's a couple more pictres, the cross section (including the somewhat misshapen looking bite I took out of the first one I picked up to see if they were something apple-like) and pips.

4 ovum chambers with 2 pips in each. Others may differ, I've only cut this one, but there you have it.