I suspect part of the problem is that Eng-er-land is so large, in comparison to the other Home Nations, that they don't have a unified National identity. There is no English national dress, is there a national dish? A traditional dance?
If you were to ask a Geordie, a Yorkshireman, a Cornish man and a Man of Kent (or a Kentish man, they can't even agree on that and they're from the same county....) what a quintessentially English dish was, would they agree with each other?
You could ask the same question of a Spanish/Catalunian/Basque, a French/Breton/Basque/Parisian or any combination of regional identities within many countries. There is no National Dress/Dish but a host of regional ones. Take Spain as one example, Flamenco is regarded as a typical Spanish dance/culture but is in fact, traditional Andalusian.