Hello, I'm new to the site and this is my first post. My 2002 172 has a misfire so I took her into Reg Vardys at Durham. I bought the car from there and the servicing, prior to me buying, has been done there. The misfire was diagnosed as a dodgy plug and I was quoted £110 to replace the set as "the plugs have to be ordered from France". This seemed expensive to me for plugs but they said as the 36k/2 year service is nearly due the plugs would be done as part of the service for £280. Does this seem right or is the dealer having a laugh? Any advice/opinions would be great,