It's good news. Get over it.
Yes, that graph does take account of inflation. You can see it doesn't flinch from showing the catastrophic effects of the 80s recession. Also, if it weren't inflation-adjusted, it would show massive (10-20% per year) increases throughout the 70s.
The article is completely right. Manufacturing output grew by about 20% overall during Thatcher's tenure, and it's grown significantly since then. That doesn't mean there wasn't a huge recession - just that the recovery, as commonly happens, carried on to a higher point than the start.
Now Britain is becoming a more service-based economy. That's a good thing: it means a much higher proportion of people get to live in ways that were previously only available to the wealthy middle classes. There are people to cook food and make our drinks for us (in restaurants and cafes - your working-class ancestors, pre-WWII, probably never set foot in such a place from one year's end to the next, unless as a waiter); people to entertain us on demand (just by switching on a TV); machines and people (dry cleaners) to do our laundry; people to repair our plumbing or our windows, or any of the thousand-and-one chores that ate up our great-grandparents' lives. How is this not good?
And all it requires is that manufacturing, and agriculture, produce more output for much less human work. Thus freeing people up not only to write code, but also to open coffee shops, cake shops, cheese shops, to make TV commercials and write blogs and publish a mind-buggering range of magazines and guides to all this "worthless" activity. There are still genuinely poor people in Britain, but the median household lifestyle now is vastly, hugely, humungously better than it was half a century ago.


