I have nothing to link you to, it was something I read in a book about Anna Andersen decades ago. Obviously it has to be taken with a grain of salt but the general gist is this:

King George V of the UK initially agreed to take in the Russian Imperial family after the Tsar fell in March, 1917. But the king changed his mind and abandoned his Russian royal cousins to their fate. (Today, the 17th, is the 105th anniversary of the family's execution.)

Rasputin died before the Tsar fell but apparently he blamed the German Battenbergs (who were living in the UK under the new name Mountbatten, along with titles such as the Marquess of Milford-Haven) for persuading George Vto spurn the Russian royal family.

It was not bad advice from a practical stand-point. The people of the UK had borne much death and suffering in World War One and forcing them to shoulder any part of the burden of the high-maintenance Russian royal family might have cost George V his own crown.

But supposedly the Mountbattens were acting out of their own dynastic plans to marry a future Mountbatten daughter to a future Prince of Wales. As it happened, they would succeed with Prince Philip (whose mother was a Mountbatten) being married to the then Princess Elizabeth. But the Mountbattens of 1917 presumably did not want the competition the Tsar's four lovely young daughters would bring to the royal marriage market.

There was also the matter of the Tsar's alleged personal fortune worth billions in the Bank of England. If the Tsar and his descendants were all eliminated this would free up the fortune to be "appropriated" by the Bank/Crown/City of London for other purposes.

I doubt that Anna Andersen was really the lost Grand Duchess Anastasia. But if she were, she was damned on this earth to be forever stripped of her identity, birth-rights, and heritage.