*Carths 1st attempt at a 'no deal' Brexit doomsday scenario*
Food Shortages: People will be starving to death because they are unable to buy the expensive exotic foods that they have become accustomed to. Fortunately a great many will survive because egg n chips, sausage n mash, pie n peas and even cheese on toast will be available.
Job Losses: I'm afraid this will not come to pass. Due to 1/6 of the nation starving to death (see above) there will be plenty of jobs to go round . . we may even have to beg for foreign workers.
Housing Shortages: There will be an initial drop in the amount of homes available due to the very rich among us instantly buying as many houses as they can in order to make a quick buck. However, after two months we should see plenty of homes becoming once more empty and affordable . . . due to it being the rich that are the 1/6th in the first paragraph.
NHS Crisis: This will be averted quite easily by people living a much healthier lifestyle. When motor cars and fuel are no longer being imported, push bikes will be the choice of transport for many. The demise of the large supermarket chains (due to no imports) will also lead to people eating healthier . . and many will not bother with the Macdonalds 'drive through' if they're on a pushbike. Medicinal drugs won't be an issue as the entrepreneurs in their new 5 bed homes will be growing cannabis and flood the market with this powerful painkiller.
Crime: Expect to see a massive reduction in crime because the police can concentrate on criminals instead of targeting motorists . . except for the occasional case of being caught '2 up' on a pushbike. Cannabis growers will be given 'exemption from prosecution' status, as they're the ones keeping the NHS afloat.
Holidays and Leisure: Caravan makers and Butlins will see a resurgence in fortunes