OK, Stanron, you've got me worried as I'm no economist. But if we leave the EU without a decent trade deal, we are well and truly stuffed. Read this article from the Independent (I'm useless at links so you'll have to google it):

Brexit: True cost of UK leaving EU without trade deal revealed

EXCLUSIVE: An analysis by The Independent of official data suggests British exporters would face a cost of at least £4.5bn - and in all likelihood they would take a hit many times larger...

Etc. And why would the EU give us a deal that would have lots of the other members rushing for the door after a similar deal? Ain't gonna happen.