Dude I just had those last year during christmas, loving goodness man
I have not seen a single Terry's Chocolate Orange Bar in the last 6 years in the whole of South West England.
Oranges are everywhere, and I tend to get one at Christmas.
The bars though, apparantly no shops sell them.
Sainsbury's, Tesco, Co-op, Morrisons, or any newsagents or sweet-shops.