Not sure if medlar's are self fertile or not. If they aren't then you need another to fertilise.

They are self fertile. We have Nottingham and it produces a good crop every year. (Disgusting things!).
For most fruit trees the thought is that they need to be from 5 to 7 years old before they fruit.

We have "Nottingham" and think the flavour is lovely.
Just let them blet in the frost to soften and then break the skin and use a spoon to scoop out the flesh. Delicious! It tastes like instant stewed apple (with no cooking needed!).
I know the French think it looks like a dog's bottom....hence their name for it "cul de chien".....

Depends on the size of the seedling you planted out. From memory, we grew a medlar in our UK home which fruited within two or three years from a bare rooted plant (from Deacons on the IOW). Eventually we dug it out as it was too near a garden pond, and also we couldn't stand the fruit.
You MUST 'blet' the fruit by leaving them until they look almost rotten before you use them. Some people love the flavour, but not us.

I know how to blet them and they still taste disgusting. Friend makes Medlar jelly which is supposed to be nice.
Love the big white flowers though.

Thanks to all who replyed.............Its never even shown flowers, by what youve all said seems the flowers will be better to look at than eating the fruit