Oak?

Oak?

Observation - Oak? - UK and Ireland. Description: These leaves are decidedly oak-like, but the fruits are not acorns: neither are they galls. Does anybody recognise the tree please? Is it an alien Quercus?

These leaves are decidedly oak-like, but the fruits are not acorns: neither are they galls. Does anybody recognise the tree please? Is it an alien Quercus?