Thanks for the info guys!
I got a message directly to Palomino and a chap called Gary Grigsby mailed me back saying there are two tanks and that most likely one of the handles has broken off... I will have to investigate that when we return to the trailer (its 150 miles away, which is why I was trying to get info before I go back to it). If the pull rod has broken off I guess I will still be able to open it with a wrench of some sort until I can get it sorted. Worst case is we have to use the campsite showers for a while - no big deal really.
I will replace the seal in the water fitting that is leaking close to the heater and see if that seals it up. Think Im going to get a pressure regulator too.
Regarding campsites in the UK, I havent been to many (yet!). The one we are on at the moment is www.tattershall-lakes.com
and we like it a lot (especially as there is a Royal Air Force base on the other side of the lakes, where they house / fly Spitfires, Hurricanes, Lancaster bombers and Dakotas as part of the Battle of Britain Memorial).
Another site we are going to next year is www.billingaquadrome.com
which has some great reviews (and is only a few miles from our main drag strip, Santa Pod Raceway, more of a bonus for me than my wife!).
Most of the sites in the UK wouldnt be big enough for American RVs, but a couple of long time RVers have brought out a publication which details all the sites that can take A class, 5th wheels etc so thats a good reference for us to use www.the-big-pitch-guide.com
. Almost everyone who sees our 5er has the same negative comment "where are you going to take that?!?" but there are plenty of places it seems!