May be the day he reports he’s closed? 
I don’t think he has to accept electronic or cash by law, he has the right to refuse service so it’s up to him what he accepts. He has the right to barter, as does the customer. I may be wrong but isn’t the price displayed only an offer and he can negotiate (he can just say “no” and you can accept or refuse).
Iirc, a displayed price is an “invitation to treat” and doesn’t have to be adhered to.
Cash is legal tender though and iirc has to be taken if offered unless its something unreasonable like ten pounds in 5p pieces.
A business then (nothing wrong with that as long as you are aware). Here’s a guide to credit card processing fees (courtesy of www.startups.co.uk):
Scottish and Northern Ireland bank issued notes aren’t legal tender anywhere. The only legal tender notes in the UK are Bank of England notes. IN Scotland and Northern Ireland, the only legal tender are Royal Mint coins. Apparently 1p and 2p coins are only legal tender up to the amount of 20 pence. In other words, the term “legal tender” has no practical meaning in everyday life.
A shop can accept whatever form of payment they like, and they can refuse your money. It might not be good for business, but its their right. A club member in Northern Ireland, who was a Unionist, was in Blackpool when his Ulster Bank tenner was refused in a newsagent. He just made up a law, Queen’s Instrument whatever of 1916, and scared the shopkeeper into accepting payment.
In fact, a shopkeeper has full freedom to accept whatever form of payment they like. Hence many shops in Northern Ireland will happily accept Euro denominated notes, and across the border, in places like Dundalk, they don’t care that you pay in Sterling, as long as you accept a Punt rate (1 to 1).
Scottish and Irish money are legal currency but not legal tender.
Don’t think so, not yet anyway. Many dealers prefer cash for lower-ticket cars (eg < £2,500). Bought my wife’s 2003 NB 2.5 1.8 two years ago for cash. Got a discount too.
The carnage always comes by surprise, often on an otherwise ordinary Saturday morning…
The government declares a surprise bank holiday. It shuts all the banks. It imposes capital controls to stop citizens from taking their money out of the country. Cash-sniffing dogs, which make drug-sniffing dogs look friendly, show up at airports.
At that point, the government is free to help itself to as much of the country’s wealth as it wants. It’s an all-you-can-steal buffet.
This story has recently played out in Greece, Cyprus, Argentina, and Iceland. And those are only a few recent examples. It’s happened in scores of other countries throughout history.
If you have no money in your wallet/under the mattress you will be going hungry.
Cash is King Use or Loose it
Must be the the new world order I keep hearing about. Or is it the lizard people ?