Ok, not to rain on anyone's parade about the grandparent deal. But this is what I have been told about a dozen times by the British Consulate.
I have a grandmother, here in the US,(about 12 miles away) that is from the UK, she still is a UK citizen and still has a UK passport, with a US green card. I saw on the websites about about entering under the Commonwealth Ancestory Visa, and thought "aww perfect!" Well, I called, and Commonwealth means Canada! Then I inquired about entering under the ancestory visa, and they said ONLY if your parent was a UK citizen could you enter under that visa provision.
So.....I am to the enter under the fiance visa, and no work till we are married.
Luckily my fiance was all for supporting my son and I till we are married.
I do wish you luck, but in my research it was about impossible to just "move". I am really sorry, as this disappointed me, I love working, (yes I am nuts), but I have been doing it for so many years, it will be wierd to be off for a while.
Cheers!
Vonny