Tree identification please

[Gail]

I've just visited Gateley Hall which is a very beautiful 18th century building near here. They have a gorgeous mature tree which I didn't recognise. The owner says it is a holm oak, but I really don't think so. The leaves varied but were mostly oak-shaped but the fruit is a bitter-tasting berry.
Anyone know what it may be.

[johnralphcarpenter]

 Mulberry?

[Giles]

Might they just be developing galls? (on oak)

[johnralphcarpenter]

Don't look like oak leaves.

[Gail]

Mulberry?

Mulberry went through my mind but this has clusters of individual berries rather than a multiple fruit, so it is certainly not Morus nigra.

And it doesn't 'feel' right for oak...

[johnralphcarpenter]

White mulberry? The leaves look mulberryish.

[Gail]

The fruit is quite different though;
https://en.wikipedia.org/wiki/Morus_alba#/media/File:Morus-alba.jpg

[ArnoldT]

Doesn't look like a Holm oak leaf.

[johnralphcarpenter]

Decayed fruit?

[Gail]

The fruit looked as though it were just ripening. I didn't try it but my friend said it tasted bitter.

[johnralphcarpenter]

Morus rubra? Unripe fruit would be bitter.

[ArnoldT]

Doesn't look like mulberry fruit.

The mulberry is a drupe, somewhat like a raspberry.

[Bart]

Think the owner might be right, quercus ilex.

[Ali Baba]

I cant tell you what it is, but it clearly isn't an oak. All oaks have a variation on the 'cupule with single seed' type fruit (i.e. an acorn). Not a mulberry either (the fruit looks wrong and the tree is way too big). If it didn't have the fruit in the picture I would call it a Turner's Oak which is a hybrid of Q. robur and Q. ilex (the holm oak), but it cant be that. Puzzling...

[Giles]

?