Had the Civil War not happened England would still look pretty much like it does today. Things would probably work about the same, too. The only thing that would be significantly different would be the population. There would be just as many people, but they would be different people.
Of all the men who went out and died in the Civil War a great many would have been relatively young men. The young women they left at home would, after the men died in battle, have gone on to marry and procreate with others who survived. Had those men not died many of them would have become husbands to those women, thus their progeny would be genetically different. They would represent a very significant fraction of the population by now, so the country would be just as populated, but most of us here now wouldn't be.
The royal family would be a different bunch, too. Perhaps even different enough to have avoided one or two of the wars that came along after the Civil War would have taken place. Maybe they'd have been closer to their European kin and things like WWI might not have been necessary. Then, as the humiliation of the 'Vaterland', was the cause of one of the larger chips on Hitler's shoulder, even WWII might have been avoided.
Mind you, whoever the royals would have become back then would almost certainly have got England involved in other wars, that never happened in this timeline, resulting in possibly similar outcomes to those wars noted in our history.
Whatever the weather, the non-event status of the English Civil War would have one very definite effect - Numismatists would lose a number of highly-prized collectables - there would be no 'Siege Money' from the various cities that experienced such tactics. Those items are now extremely rare and sell for tens of thousands.
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