I'd take Vivian out, but only for short periods and places where she'd be safe , but I have no problem with her exploring my garden for a good 10-20 mins , obviously as long as I'm there (she's my precious). If I had the opportunity I would take her to school for a little show or outside for a little bit but I am honestly petrified of some hateful moron snatching her from me it killing her on the spot .
I think it's better to do it for diurnal species as there is little stress risk unlike nocturnal species such as BP's .
As long as you trust your self , your snake and the people around you it should be acceptable.
I too live in the UK and there is no law against it .
I think it would be nice to see more snakes out and about with their owners but it's up to the keeper not society , though one does have to watch out for the latter .
Stan
Stan:
Vivian the cornsnake
Nymeria the Het. Pied Royal
Baldrick the Piebald Royal
Larry and Lizzy the common wall lizards