I have an 07-plate Skoda Octavia vRS diesel. It has a full Skoda service history with 72,000 miles (the next service is due at 78,000). Recently, the particulate filter warning came on and I followed the remedial instructions as highlighted in the owners manual to clear this. Unfortunately the message didn't clear and the workshop message came up. I had an independent diagnostic done and they said the filter was ruined and I should go to Skoda. Should this have failed on a three-year-old car? If not, what sort of help should I expect from Skoda considering the part costs £1150?