Just found the website its
www.dobies.co.uk
Details on the site about the tree are as follows:-
A beautiful tree with unusual fruits!
Medlar Westeveldt
An extremely attractive and quite fascinating tree (a relative of the Quince family), with large, glossy leaves, beautiful white blossom in springtime and pretty bronze foliage in autumn. The curious flattish fruit are aready to pick in October and should then be stored for a few weeks (known as bletting) to fully develop their truffle-like flavour. A fine accompaniment to wine and cheese! (Last order time is end of February 2006.)
Culture Full growing instructions included.
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1 Tree £ 18.95
Delivery period: Early February-early March 2006
Code: 479738
There's also a good image of the Medlar friut.