The history curriculum in the UK is really all kinds of useless. It's not that it overlooks the Empire. When I was at high school it had nothing to say on anything international at all beyond World War 1 and 2. You could graduate high school having no idea whatsoever about the forces that shaped the 20th century. Stalin? Mao? JFK? The Apollo Programme? The Great Depression? None of it was mentioned.
I had history classes for years but the only stuff I remember is trivia about the industrial revolution. We were made to memorise vast quantities of detail on things like the exact dates of various Mines Acts (safety for coal miners), who invented some kinds of obsolete farming equipment, etc. There was a lot on medieval agricultural practices as well. It went far too deep on things that impart no wisdom or generalised lessons for the modern world.
There was also a lot of stuff on World War 1 and World War 2. Important, yes, but also incredibly well covered by popular culture.
I suspect the curriculum was designed to be as boring and non-controversial as possible, which is a pity. The only reason to study history is to learn lessons from it, which must inevitably mean drawing conclusions from the events of the past. Attempting to avoid that ends up reducing history to a list of kings and dates.
If I could rewrite the history curriculum, I'd give it a major renewed focus on both the British Empire and also the full history of the 20th century. It would be shallow but broad. And it would include the chaotic state of Britain between 1945 and 1990. Of course the reason it's not taught is that many teachers have very strong ideological views of their own on, in particular, Margaret Thatcher.