It's not a problem just yet, although the toms and peppers are a little bit of a logictical effort. The overwinter onions and beans are looking fine.
Barring cataclysmic rains, my potatoes will go ahead as usual in 3rd week of March regardless, as I have found most early problems are easier to deal with than blight at the other end of the season, so I try to get even the maincrops to some sort of size before blight comes calling.
Everything will be sown on normal dates, but then I do have a cold greenhouse that is an absolute must any year in my opinion. If no greenhouse, then cloches can be erected to do mostly the same job. I do so for the overflow at peak times. I can't speak for the hardening off yet obviously going into April, but will meet that when I come to it. However, susceptible cusp plants will be sown in larger pots rather than modules, with a bit more food, just in case there are planting out issues later. The one thing I try to avoid is seedlings getting off to a bad start.
Tomatoes and peppers will go back to the greenhouse, double insulated, by the weekend, as soon as the worst of the cold has gone. My biggest problem, looking at the forecast is having the soil dry enough to pepare the beds properly. I can see me having a hard couple of days when a window finally arrives.
It's not all bad news hopefully, as this nasty winter will have killed off a few more pests than normal. Maybe even the slugs will have taken a hit.