In some ways I could have given this a good rating. As a mystery, which builds up the character and story of various central characters (principally the popular and elite classes of England's southeast, North, and adjacent UK nations). It definitely kept my attention (except for some of the messier episodes of fratricidal feudal kings). What would be the twist at the end - who is the villain, who is the gritty English hero when we get to the final episode, looking at Blair and Johnson and Brexit? (I would add Corbyn, the most interesting figure in British politics in decades, but Hawes isn't even willing to name him, instead looking to Sir Keir Starmer as the herald of the future - I suspect he will be sore disappointed there).
But in reality this isn't a mystery, nor an opinion essay on the future of Britain - well, it's not meant to be, it's meant to be a short history. I'm not a historian but I can be fairly sure this history is a bad one. It takes cherry-picked stories, with the author's simple (and unreferenced) assertions as to their meaning, and weaves them into its narrative. That narrative is all about England, despite the enormous impact of England on the wider world, but also, of the wider world's impact on England mediated through the contact afforded by Empire. I could suggest a couple of other more appropriate titles - The Narrowest, or Most Insular history. It's not that Britain's empire, and cruelty, are not mentioned. They are there, but only very briefly as if the real motor of England's history was just the conflict between it's north and south and the various elites and popular classes of each region. And some of the brief mentions are woeful - like the White Saviour narrative of Britain ridding the world of slavery.
When the account reached the industrial era, that I'm somewhat more familiar with, I started to realise a lot of the interpretation given to figures and events is not much more than a series of historical "hot takes" - in the Merriam-Webster dictionary's sense, ie "a quickly produced, strongly worded, and often deliberately provocative or sensational opinion or reaction". I don't know about the earlier history. I would have at least appreciated a more neutral account of history - neutral in that it should acknowledge various interpretations of history, rather than just pushing the author's view.
So this is a mercenary, liberal-centrist view of history. It's urbane, readable, polemical, it might even be thought-provoking for some; but it's too opinionated, simplistic, unbalanced, and frankly unreliable to pass as good history. If the author had written it as polemical essay, I would have enjoyed it more, but calling it a history risks that someone might take it as a good introduction to history and come out at the end of it having just reached the first peak of the Dunning-Kruger curve (the peak named Mount Stupid).