Arhh, Rob there you are. Sorry things did not work out, especially after you put yourself out in moving to Holland.
Re the battery, you should have an isolator knob on the terminal closer to the front of the car. Switch that off and then connect your charger. Personally, I would disconnect the negative terminal also, but thats just me. If its quick and easy to get off, I would do it. There is always the risk that the power from the charger can surge and upset or blow the sensitive electrical system.
I have a trickle charger that came with the car, never used it, but you could rig it up on a timer switch so it comes on for a couple of hours a day. The best thing I have seen is at La Butte, Loz's mate in France house. He had a solar panel on his shed which was a trickle charger, so it only charges during the day, very cleaver idea.