GardenBanter.co.uk - Trying to ID a mysterious fruit

On Sat, 01 Dec 2007 14:34:03 +0000, Sacha
wrote:

Over on uk.rec.gardening, we're trying to identify this mysterious fruit
which we were given a couple of days ago. It is growing on a bush in a
garden near Bristol:

They smell very faintly citrusy to me and each seed chamber has two seeds in
each side. She's not a gardener so can only tell me that the leaves are
leaf shaped, not huge, not leathery and that the fruits are autumnal.
http://i16.tinypic.com/7x8rupj.jpg

Here's another pic of it cut across the fruit. You can see the indentations
of the ridges clearly. As I say, it's about the size of a chestnut and a
little reminiscent of one when peeled and cooked.
http://i4.tinypic.com/7yofkfd.jpg

Is it the same as one of these?

http://85.17.40.58/full/15/046b98655.../507948638.jpg