As you can imagine a million to 1 chance of it going down the hole and into the rocker cover. I couldn't even see it, so had to bite the bullit and remove the rocker cover, which is a job and a half. Luckily once the rocker cover was removed i could see the clip and with a couple of screw drivers and my head torch managed to ease it out, a lucky escape
Its all back together and I only managed to break part of the cam cover, so the moral of the story make sure you put the oil filler cap back in place before anything falls down the hole, this is the first time its happened to me with over twenty years of working on cars. (would of been easier on a Ford Cortina)
Have a great weekend.
Ade