My wipers have seen a lot of action in the last 24 hours, travelling to Castle Combe in torrential rain and they then packed up whilst on circuit. It's not a fuse, the washer still works but the wiper motor is making a sound continuously, even when switched off. When I move it to the faster speed setting I can hear it working faster but nothing at the wipers. The wipers cannot be moved by hand, I was told to check this in case the worm drive had failed. I've had the switch out and tried some contact cleaner but that didn't fix it. Any ideas what the try next? Could it be a switch issue? BTW Rain-x is a great wiper substitute and got me home fine in even more rain on the M5. The car is a 2018 Sigma. BBTW great day out at CC today, thanks Simon and James plus all the instructors!