The media has always been Anglo centric, I noticed it even as a child, particularly on sports coverage
All media, other than than the licence paying BBC is about 'sales'. Most widely read titles are based in England, understandably so, as the population of England outnumbers Scotland by 10 to 1 and Wales by almost 20 to 1. Why the news they contains shouldn't be 'anglo-centric' I'm not quite sure as they are purchased and read overwhelmingly by the population of England.
Unlike Scotland and Wales there are few (if any) 'England only' newspapers, other than regional titles. There's no Scotsman, Herald, Daily Record etc. for England only. No Western Mail or Daily Post for England only. There are however Scottish editions of most major UK titles.
Why do you think over 50 million English people would want to be reading in detail about Scottish sport for example?
Anything that happens in Scotland that relates to the whole of the UK is reported .. but day-to-day Scottish news isn't of a huge amount of interest to those of us at the other end of the country is it? This is why we have regional newspapers, TV and Radio.
The population of Scotland is smaller than the population of Yorkshire. Should Yorkshire news therefore have more prominence in UK newspapers, TV and Radio .... seeing as how are more of them than there are of you?
Not really .... when it is only of interest to those living in Yorkshire and they can watch, listen and read about it in their own regional media.