I have an 06-plate 1.6 HDI Sport 207. A few weeks ago I was driving locally when it seemed difficult to select first gear or change gear. By the time I got home a couple of miles later I couldn't get it into gear at all and had to push it. Started it up yesterday for first time since and gear selection seems back to normal, but I daren't go anywhere in case it previous problem recurs. Does anyone know what the problem is?