Just wanted to say a huge thanks to everyone's posts on this thread and my wonderful Dad.
My wipers stopped working after ice and snow. We checked the obvious like the fuses and the car was booked in for a new wiper motor fitting. Fortunately the motors were on back order and the repair had to be delayed and this is when I found this thread. Mine was also the earth lead. My wonderful father replaced this for me and the wipers are now working and he has saved me about £200 | 
