Ask an Immigration Solicitor. Get an Answer ASAP.
I was also born in the same country (now Sri Lanka) in 1959. My point was my father was born in a British Colony and I came to UK in May 2009 with my family (Wife and two children born in Sri Lanka in 1958, 1991 and 1997 respectively). All of us got Indefinite Leave to Remain in the UK in March 2014. Three of us have also passed the LIUK test and IELTS when we applied . Thanks