Sadly, I have some sort of personality disorder that compells me to present alternative points of view. ;)

The concept of Englishness is somewhat nebulous. The land has been populated since around 700,000 BC. It only became an island around 6,000 BC. Some people think we go back to Celtic times but they arrived arouns 500 BC. 45 BC and the Romans arrived and took over. The Angles and Saxons arrived after the Romans left in 410 BC.

The name of the Angles tribe is where the words English and England come from - Angle Land. They held sway until the Vikings (or Norsemen) came from Scandinavia around 800 AD. That lasted a few years until a second wave of Vikings, the Norman (Norsemen) French installed themselves in 1066. Lots of French words added to the vocabulary after that. The elite would all speak French. The video happily shows the Tower of London, built by the Normans, implying it is an example of Englishness.

We emerged from the Middle Ages with a Welshman as king, Henry Tudor, in 1485. The last Tudor queen spent much time trying to keep the Scots away from the English throne but when she dies a Scottish king took over, James VI of Scotland AKA James I of England. Then we had our military dictatorship under oliver Cromwell and a coup orchestrated by William of Orange in Holland to become William III of England, Ireland and Scotland in 1689.

Than lasted until he was swapped out for a German royal family - who all spoke German right up to and including Queen Victoria. Interestingly, the narrator of the video in the post seems to revere the names of George and Victoria that were also popular with this new German dynasty.

During all that time Britain was quite happy creating an empire but has often been less enthusiastic when the citizens of that empire turned up in Britain in spite of the fact that those dominions were willing to go to war on Britain's behalf.

So, it is difficult to spot a time when the romantic view of England being English actually happened. There were a few hundred thousand years of no Englishness, followed by Celts and Romans. Then some Germanic tribes arrived, some Danes, French, Welsh, Scots, Dutch and finally Germans again. They all imported their own people and the Empire encouraged even more - and I bet his family were not asked about any of that.