CanadianGran
I agree that imposing a UK passport on a person born in another country because one of their parents was born in Uk seems outrageous.
If I were to try to get a UK passport, I would have to provide my mother's birth certificate, her marriage certificate and proof of her citizenship. My mother has been deceased for over 20 years, and I don't even know if the documents exists or where I would obtain copies. That in itself would be very expensive from here in Canada.
I do hope that the entry visa would be good enough if I am a tourist. I have no plans to travel but I could see that it could stop me from going there if I had to spend months and dollars tracking down documents.
I think automatic citizenship may not apply to you, unless you were born in or after 2006, CanadianGran which I assume, by your username, you were not.
But please check, as I said, it is very confusing.
It is confusing because you may have been born before 1983:
You were born before 1983
You may automatically be a British citizen if you were born before 1 January 1983 and:
you were born outside the UK
your father is British
As I said, it has not been thought through.