In anticipation of changing the gearbox oil in the next few days, I decided to check that I could access and undo the filler plug okay. I removed the battery followed by the battery box, and the filler plug was then easily accesible and with a bit of a struggle it came undone, and the whole process was much easier than expected. With the battery out I took the opportunity to clean all the newly exposed parts. While the battery was out I also decided to check access to all the passenger-side lights and I'm pleased to know that they were reasonably straightforward too. So now, whenever I change a bulb, I will definitely take the battery out. The only hiccup was that when I re-connected the battery the alarm went off. I was able to unlock/lock all the doors okay, and the engine would start but the alarm carried on. Then it stopped for a few seconds and then started again. That on/off repeated again and then the alarm stopped and it's okay now. Is anyone able to suggest if that is normal or if there is a set procedure for resetting things after the battery has been disconnected? Any advice would be appreciated.