What kind of bird visited

I dont have a photo because by the time i realised i wasnt sure what it was it was gone

A bird somewhat resembling a long tailed tit in size and shape (may have been slightly on the larger size though) visited our feeders

However the markings seemed so much more striking, and it also had reddish brown bars over its eyes (think male house sparrow but more brown than red)

Ive done a bit of searching but found nothing

Wondering if it was just a genetic mutation (we get various birds, mostly tits, with a high expression of a melanin mutation or leucistic mutations) the thing that makes me think it unlikely to be that was how crisp the markings were

Other than the face and neck markings im fairly sure the rest matched a long-tailed tit