I've seen the pastry, but never heard the name palmier.
I saw "campy" quite often (and the comparative but not the superlative form), probably in the 60s or 70s, but don't remember hearing or seeing it much recently.
And Pat and Linda, I think the only program I've seen, of all the ones you mentioned, is Britain's Got Talent, mostly when I've been visiting my English friends or when someone posts a link on Facebook or email.