New member here with a tale to tell ( already ! ).
Recently collected my 2004 C-max 2.0 ltr diesel from Brentwood; on the way back to deepest Wales I got stuck on a sharp hill, unable to select 1st or 3rd gear. Thought no more of it, probably me I thought. It continued to refuse to select either reverse, 1st, 3rd or 5th over the next two or three trips. The first mechanic said it sounded like the baulk rings. The second mechanic said it wasn't the cables or the clutch plate so it has to be the hydraulics. Left him to order the relevant parts. In the meantime I thought I might just have a quick peep myself. On taking out the air filter body to reveal the selector mechanism what do we see ( rhetoric question ) yes, of course, jammed between the selector cables was the mirror and backing of somebody's old wing mirror !!!!!! Gear change now works perfectly. Moral: "Things are not always what they seem"
Merry Christmas all.