The native British oaks, Quercus robur (pendunculate) , Quercus petraea (sessile), are pretty common, but white oak is an import and not widely available. Interesting though that an
entire species are reputed to not be full of tannin,
I find that just like apples, trees
from the same species frequently have different properties. My local oaks shed acorns that are edible just as they are, but a mile away there are some so bitter that I don't even want to try leaching the tannin from them.
right enough though, those were planted ones, not wild seeded.
cheers,
Toddy