Interesting points. As immigrant communities go, the English don't have one do they? The Irish are the best immigrants in the world, not always their choice of course, but there are Irish pubs and clubs in every city in the world, networks of people to get you settled in and help with work....not so many English clubs. The Scots have Burns clubs, The Polish have clubs, Croatians, Greeks, Italians with communities centred around Italian restaurants, even the Lebanese in Australia....but they are all smaller of course. The English organise nothing, the expectation is that you just go it alone but there is no sense of any "belonging" to anything?
What is the English niche..I don't think we actually have an immigrant identity because we were used to taking things over and trying to shape them to be absorbed into our culture, rather than assimilating. It's a fascinating culture, even going back to William the Conqueror and a Norman King who invaded England and then his French people took on the identity of the English rather than make it an extension of Normandy. I don't think that's ever happened anywhere where the conquered have won the culture war by acting like a sponge despite losing the actual war and leadership power.