Long out-of-date. Some random thoughts:
Taylor refers to England and Britain interchangeably which is very much of his time but still jarring for a Scot.
Still, for an Englishman, he is very balanced when pointing out that the UK's actions are not always fair and even. When the USSR asked for an interest in Libya post-World War 2, the British and Americans thought it 'very Asian' and aggressive of them. This despite the fact that Britain wasn't giving up control of both entrances to the Med and that, if America had asked for the same interest in Libya, no one would have blinked an eye.
Taylor says that Napoleon's wars were, apart from 1815, preventative wars. Only if you use an extremely forgiving meaning to the word 'preventative'. He even manages to argue that the invasion of Russia in 1812 was 'preventative'!
Regarding the WW2 chapter, it was written before the work done by Stephen Budiansky and hence repeats the erroneous claim that Britain was almost brought to the brink by the U-boat war. In fact, new merchant ship production outstripped losses.'.
The chapter on the Cold War, written in the mid-70s(?) suffers most from a lack of a long-view - he focuses on the wrong things and sometimes draws the wrong conclusions.
The Kindle version suffers from bad proofreading - typos (years seem to be a hotspot with '1915' for '1945', for example), spelling and grammar issues, along with some repetition within the same or consecutive paragraphs.
I'll finish with a quote from the end of the book which is both a relief and a damning indictment of modern nations:
'On the whole we have done pretty well since the war in not producing any great men. Great men are splendid in war time, maybe essential, but they can be dangerous in peace time.'