I have one that grows just outside our gate and gives lovely big, sweet acorns.
According to wikki -
There are two subspecies:
Quercus ilex subsp. ilex. Native in the north and east of the species' range, from northern Iberia and France east to Greece. Leaves narrow; acorns 2 cm long, bitter tasting.
Quercus ilex subsp. rotundifolia (syn. Q. rotundifolia, Q. ballota). Native in the southwest of the species' range, in central and southern Iberia (Portugal and Spain) and northwest Africa. Leaves broader; acorns 2.5 cm long, sweet tasting.
I'm guessing that I live pretty well on the border where the two species overlap, as there are a lot of oak trees around with more holly shaped leaves, but 'my' one is less holly like and has sweet acorns, which would fit with it being
Quercus ilex subsp.
rotundifolia. The locals call it a ballota.
I think I'm gonna have to collect a load more acorns this year...
Here's a photo, taken last April.