I think everyone should be quite careful of responding to knee-jerk reaction newspaper headlines with panic, that only promotes panic buying and makes any perceived temporary food shortages worse!
Some items, in some supermarkets, in some areas, are less adundant than usual. On a very temporary basis- it is after all the end of winter.
My online Sainsburys delivery today certainly has everything I ordered- 6 peppers, cucumber, 2 lettuces, a salad bag, parsley, spinach, blueberries...
please keep calm people and dont believe the headlines- there is plenty veg for everypig and every human to meet their daily requirements, perhaps a bit less chouce, and not as many, and you might have to shop around a bit more than usual, or shop twice in a week instead of once, or shop online- but there is certainly no evidence yet of any extreme shortages! Newspapers headlines do far more damage than the problems they report on, exaggerating things to scare people, its very irresponsible