I wear a size 9. A UK7 is a 9-1/2.
If they were too big I'd wear thick socks. No biggie.
But...
I cannot wear this boot  I can get them on, but...
Dr. Marten's are no longer oversized. At least this pair is not.
My foot length is 9.75 in. = 24.77 cm.
The boot length measures 9.75 in. inside
Maybe it was marked incorrectly. Made in Vietnam. EU41, US9, UK7.
Back in the box...