10degrees If you don't trust "Remain" sources,
then read the daily blog of Dr Richard North who has campaigned for Brexit for about the last 30 years.
He has been screaming warnings about the horrendous consequences of no deal, or indeed any deal that menas leaving the Single Market.
(However, he still wants to Leave, even if the economy crashes totally)
He makes it clear that the consequences of leaving the SM are automatic, under WTO /WCO rules,
NOT the EU taking any "punishment" action - if they give us cherries, they destroy the SM on which their prosperity depends.
This is a recent one about farming / agricultural exports:
http://www.eureferendum.com/blogview.aspx?blogno=87006
or this, outlining again the consequences of no deal: logjammed ports and delayed food supplies:
http://www.eureferendum.com/blogview.aspx?blogno=86951
"it will be a disaster"
"a "no deal" applying from the 29 March next year will result in every shipment moving by road vehicle between the UK and the EU requiring customs clearance.
Millions of lorries, with hundreds of millions of shipments move this way every year.
Each shipment will require both an export clearance for departure and an import clearance for arrival regardless of the direction of travel.
...
no ferry port (or the tunnel) has facilities to accommodate this extra customs work – in the UK or the EU.
There is no processing point that can handle the volume of business.
There are not enough customs agents to handle the business, nor enough customs officers.
With the lack of knowledge and skills massive numbers of processing mistakes will be made in respect of duties and VAT – therefore current processing times will not be achievable."
He refers to latest press statement by the Road Haulage Association:
https://www.rha.uk.net/getmedia/c98d0219-fcf7-434e-b9cd-51f2ff0c316c/180730-Brexit-pull-your-finger-out-final.pdf.aspx