This visa category is for citizens of Commonwealth nations with one or more grandparents who was born in the UK.
You must be able to prove your relationship to the British ancestor, and also be planning to work to support yourself while you are in the UK.
You will have to show that you have a grandparent born in the UK, including the Channel Islands, on and Isle of Man, a British registered ship or aircraft.
They can also have been born in the territory which is now the Republic of Ireland, before March 31, 1922.
You can claim ancestry through adoptive parents, though not step-parents.
You must be 17 years of age or older, and be able to show that you have enough money to support yourself without accessing public funds (benefits). You must also be willing and able to work.
You will be entitled to stay for up to five years in the UK on this visa, after which you can apply for Indefinite Leave to Remain (Settlement). You can also apply to bring family members with you.
You will not be able to switch to this type of visa if you are already in the UK under a different immigration category, or to access public funds (benefits).