This is extremely helpful, thank you so much @secret.simon for your answer. I learned two key things: British citizenship by descent can't be "upgraded" to British citizenship otherwise than by descent. Once the children are registered as British citizens under Section 3(2), they can't then be re ...

I was born abroad and am a British citizen by descent (my parents are British). I spent 3 years in the UK before my children were born, so I'm considering applying for my children's citizenship through section 3(2) of MN1. I understand that if I do this, my children's kids won't automatically be ...