The white people's eye evoke a passion and light you don't find in the eyes of animals like those on the right. You can see the soul and lack there of lol. Scary that we've let so many monster in
It's rare but possible. There's a lame YTer called Will Tennyson, he did a DNA test on his channel and it came back 100% white, something like 80% English. He has black hair and eyes.
I've met a British girl with black hair and eyes, and she's definitely pure. It's simply a variant.
I would suspect that anyone from the British isles with black hair and brown eyes actually has Spanish/Berber admixture, like the so-called "black Irish". The reason they show up as "100% British" in DNA tests is that the results for those tests are based on how reference subjects self-identified. For example, if a "black Irish" person self-identified as pure Irish in the test's reference matrix, then any "black Irish" person who takes the test is going to get back a pure Irish result.