I'm afraid I've moved a Folk Club offshore too, well two actually and clicked the Undo thingy but only one went back. Too easy to do this as what you're trying to do is drag the map over but if you're on a marker that drags instead. Good idea in principle. I tried to add a local FC but it twigged who I was! as a collaborator and led me to the Faversham FC box which I promise I left unmolested. Tricky to know how to let anyone add stuff without wrecking it.