Wrong on two counts.

The Celts remained hunter-gatherers, and made their living by raiding the Saxon farmers — mass murder and theft.

The Royal Family has not been English since 1066. If the half-English Prince George ever comes to the throne, he will be the first king of England since Harold Godwinson to have any actual English blood. So however the Royal Wealth was amassed, it was not amassed by the English, but from them by a bunch of French and Germans! (Always the French and Germans!).