After more 'evidence' of further visits up north have emerged, I do now agree he has behaved in a stupid manner while in the public eye and likely to be found out, but I do not think he needs to resign. I don't believe the others mentioned, Ferguson etc. have resigned from their actual posts but are just no longer being used as public information spokespeople on tv.
However, I also have never agreed with the lockdown rules either. Being able to stand in the same shopping aisle as a stranger shopping in Tesco but not being able to go and say hello to your gran over the fence while walking past , when she is sitting in her own front garden, makes absolutely no sense at all and was, in my opinion, just an exercise in mass public compliance, as is the clapping business also.