thanks @Nodge68 Any clue if it's something someone with the correct diagnostic equipment would be able to find out? It looks like there are some fault codes relating to "sounders" but I wonder if they're more to do with the alarm system.

Morning. I've had a LR2 2012 SD4 HSE for a few years now and have already found solutions to several niggles on this forum. My latest issue seems to less straight forward but I hope some might be able to help. A couple of days ago I was driving along, put my indicator on, everything was OK but...