8% is typically a great-great-grandparent.
Assuming you were born in the 70's and your parents were born in the 40-50's (total guess) your GG-grandparents could have been born around 1900. Your ancestor could have been a local Cypriot woman married to a British officer during the British administration in Cyprus, just as an example, these things aren't common necessarily but not unheard of either.
That's interesting thanks.
That's not too far back to go. I might have a go sometime and see what I can find!
I remember I looked once when some census records were free and I think I found my great-grandfather. He was working at Penshaw staithes near Fatfield when the pits were in operation. I didn't know him as both great-grandparents on my Dad's side passed before I was born.

