The biggest issue was that our industries declined during the 70s and 80s when we were competing against Taiwan, and the old east nations who could whip us on wage costs. That had nothing to do with anything that Labour or Conservatives did, it was a fact of the economic change that abounded. The way that Labour fought back against this was to shift a lot of our economy to financial services. This of course worked for a long time as the banks were effectively allowed to do what the hell they liked. When the banking system had a meltdown because of this we were left with little to no economic power, that is why things are a mess.
In terms of moving to where you can find work I think that is way easier said than done nowadays, if as a northerner I wanted to go move to the south east housing costs would make it virtually impossible. On the other hand I live in the countryside and travel two hours, each way, to work every day as a short term contractor, so I earn my money hard!
On the point of Europe I am broadly pro, I dont think leaving will do us any good nowadays. Economic trade would be much harder and those deals we have would be harder to negotiate. Personally I would stay in, coming out will save us very little overall.