Most UK busnesses are already prepared for a no deal WTO scenario. Indeed, HMRC have been sending out letters for the past few months telling VAT-registered people what to do in the evnt of a no deal. Likewise, the EU announced that they had finished preparations for no deal.
The worst case scenario, thhough, is May's WA. As Steven Woolfe MEP tweeted tonight (in response to a Nadine Dorries tweet):
"Nadine I'm here in the EU parliament where everybody asks "why do British MPs think the WA is leaving the EU when we have taken control of the UK through it" The WA is soft remain and can never be described as leaving. Just info for you "
Also, her extension appears to have run into legal difficulties. This evening it has been reported that former Court of Appeal judge Sir Richard Aikens has said. “The way the government has acted...is, at the least, highly unsatisfactory. It must be arguable that the government has acted illegally.”
UPDATE (seen elsewhere)** Sir Bill Cash and the actual ERG's solicitors have sent to PM pointing out that at the moment it is illegal to extend Art 50 so we must leave on 29th March with No Deal.
May is a clown who, together with Olly Robbins, has made this country a laughing stock.