If you are a Commonwealth citizen with a grandparent who was born in the UK, including the Channel Islands or the Isle of Man, you can apply for a UK visa in this category. This would enable you to stay in UK for 5 years and give you a full-range work permit. The claim to ancestry is relevant even in case of adoption of your parent or you in relation with your grandparent.
Qualifying details of the grandparent
The grandparent must have been born in any one of the following circumstances:
Your spouse and your child/ children can accompany you to UK, if proper documents of family relations, including a marriage certificate or a civil relationship registration certificate, is furnished.