I think you've got to try and keep things in perspective though. Although its 85% up on this time last year, with over a million confirmed cases, that still only equates to 1-2% of the population (by my albeit terrible maths - 1M cases/62M population x 100). Obviously there will be many more unconfirmed cases, but even if it were 10 times more actual cases then that would equate to 10% of the population - so 9 out of 10 people will not get it. If you think about it in those terms its not too bad.
Saying that....I really do think peope should stick by the 48h rule and not pop to the shops, or socialise or whatever until they are symptom-free for the full 48h. And then be very vigiliant with hygiene for a week after. My MIL travelled to us for Xmas after she'd stopped chucking up for 48h, but was still in the throes of diarrhoea. I think she thought she'd wouldn't be contagious to us as she always washes her hands after going to the loo. But the thing is as it is so highly contagious if you're not absolutely meticulous with hand washing and other hygiene measures you can still pass it on. Its not just people with poor hygiene standards that get, and pass on, noro. We were lucky and didn't catch anything - I was meticulous with bleaching toilets/bathrooms/door handles/other surfaces, towel changes, etc, and she was meticulous with hand washing too.
When you're out and about I would try to get into the habit of not touching your face with your hands, and washing your hands once you come back into the house, and certainly before eating. However, its all a bit random, as I just let my DC be DC - try to discourage them from stuffing random stuff in their mouths, washing their hands before eating and possibly after coming home from school, but otherwise, I think I'd do more harm than good getting them to be OTT about hygiene. That said, I do try and avoid soft play areas - but if they're invited to a party at one, its fine for them to go and have fun.