[shibby]

I don't know anyone who sounds like the 'British' version I also doubt that that dialect would be preferred.

It would fall under the 'Queens English' or 'received pronunciation', which, in some studies, is considered less intelligent than Yorkshire dialect - http://www.theguardian.com/uk/2008/apr/04/6

[pbhjpbhj]

The "Have a wonderful" part is not uncommon but the "day" with long drawling "a" sounds super-strange to me.