Unfortunately these "elf & safety" schemes require the giving up of ones own common sense. I see so many with a card but a complete lack of awareness of their surroundings
On the van signwriting:-
I think it's good & professional to rock up in your show van.
In my preferred line of new house building I feel no need to be sign written as I have no customer until the house is finished.
I have no need to advertise as I have more than enough work.
One or two of the sub-contractors I use prefer not to be sign written. One uses his van at weekends/holidays to tow his caravan for family holidays and most caravan sites won't allow sign written vans