I sort by time ending soonest and the C&C was showing randomly. However, if you click into those items, there is no option to select it as a postage option. My guess is that it's switched off, but it's just taking a bit of time to remove it from the main screen. Maybe when they relist it might disappear?

I figured I'd just leave it go for a day or two and see what happens, but it could make for a wonderful buying experience in the meanwhile if a buyer specifically wants C & C - another good one eBay !