Being born on the Isle of Skye doesn't make a dog a 'Skye Terrier' ... unless, of course, the parents are BOTH of that particular breed.

However, in human terms - based on the premise that one of the parents (in this case, the *father as it happens) is English - the unborn child will, at the time of his/her birth, be British by descent ... and assuming paternity can be proven (if, indeed, *he's still traceable) should, in turn, become eligible for registration as a British citizen.

's purely my analogy of the situation. But there again ... ... it could be incorrect ... especially if the parents were to remain unmarried.