Learn how to apply for UK citizenship via Form UKM, a registration process for people born to British mothers before to January 1, 1983. You might have been eligible under Section 4C of the British Nationality Act 1981 if you would have had the right of abode in the UK and been a citizen of the United Kingdom and Colonies if women could have been granted citizenship equally at the time. https://immigrationassist.blogspot.com/2024/11/lost-your-spouse-in-uk-heres-how-you.html