I know King Alfred was key in bringing the Kingdoms of England together. But I was wondering at around what point did England feel united rather than a mix of the Norman and Anglo-Saxon?
I watched a doco that it was only around Chaucers time that the vernacular between the English ruling class and the people finally united, heretofore speaking an early form of French and English respectively.
If you are willing to link popular literature with cultural identity, you could argue that it took until the 14th century.
Your term "feels united" is difficult to work with - I'm sure the barons felt that they owned all the land and that they owned allegiance to an English king. Yet they still spoke a different language. However, if you look at fashion and tastes, Ian Mortimers account of 14thC England has them branching out already on their own style different from the Continental styles already. So a bit earlier than Chaucer but only by about 60 years.
Source - 'The Plantagenents' BBC documentary by Prof Bartlett (2014), Time Travellers Guide of Medieval England (14thC).