My car was in the
Dealer today for a pressure sensor. I asked them to have a look at the seals, they told me it happened on all the Leons. Thanks to your great heads up I told them I knew that already but wanted to log the fault with them in case a cure did come out. They had a look at my seals (Passenger and Driver) and ordered 2 new ones.
Whether this will fix the fault remains to be seen but I will continue the ongoing mither!!!!
Thanks again for the original post (although I was too late to fill in the form)