Try as you might Doug, you won't get a hozelock type fitting over here to fit a US city water fill, the threads are different.....which is why I bring all mine in from the States
The easiest thing to do if you need something urgently is to screw in a white city water fill hose to your inlet then cut off the other end and attach a hozelock connector jobbie to it. Alternatively your friendly RV parts supplier has a stack of the screw-in "noddies" (as I call 'em) on the shelf
You going to Newbury?