I've tried more of the nutty caramel and have to say that it doesn't taste very nutty (but you do get nuts in your teeth) - so a bit of a disappointment. Golden biscuit is still my fave - though I've never been much of a fan of popcorn anyway.
Now there's Dairy Milk with Oreo, as far as I can tell it's extremely similar to Milka with Oreo (the calories are pretty much the same), though the Dairy Milk bar is 20g bigger and you don't have to fly to Germany/import one to get hold of it
I've posted on HotUKdeals for getting it in Asda but apparently also available in Co-op.