They didn't ignore their heartlands however. If I look at the 3 places in the UK I lived in under a Labour government I saw 1.5bn a year from central government put into the NDA in Warrington and West Cumbria and the whole Silicon Glen thing on the west coast of Scotland, plus the Commonwealth Games and the investment that attracted.
In infrastructure terms the M6 Toll, I can point to 10 miles of road near Carlisle I used to use all the time (and I bet there are more projects like that around the country), Glasgow was booming with construction when I was there and all of it signed off under Labour. They were by no means a perfect government, but they for sure reinvested the bounty of a thriving global economy in the country (through borrowing, but that;s a different story).
The industrial and manufacturing jobs aren't coming back, I think everybody knows that and, I agree, there isn't an easy answer for that from any government, somebody has to answer the question about those post industrial towns (and probably people with vision who are from there) "What are they for?"
Workington has been a hole as long as I can remember (my parents live up the hill), but the thing that always struck me about the town was that the population were perfectly happy for it to be crap. Indeed, they would sneer at any attempt to improve it. Then break it. The tragedy of those places is that anyone with any ambition is currently forced to leave to get on in life. That;s the answer nobody has come up with yet.
That got a bit ranty, apologies.