G-GATJ, a British Airways A320, diverted on flight BA2620 starting in LGW, and went to MUC instead of INN. Of course, this also messes up BA2621, which would have been INN-LGW straight after. Usually, diversions from INN to MUC are due to weather. They might make two attempts at INN, and if they still can't see the runway, go to MUC. On this occasion, it was a "piece of equipment needed to land" not working. "hmm, wonder if that's the landing gear, lol". But it was the transponder, that the captain said he only needed to use at INN. What, so it's not maintained or tested, and they only notice it's broken when they try and use it?