Just wanted to thank Bay 13 for the advice on the "popping" noise on over-run coming from somewhere in our car. It was indeed a worn engine mount- the top one. After hack-sawing the old one out (easy), I took about two hours to insert the new one using a couple of bits of wood and a longish bolt (hard!). It wouldn't insert the whole way and it ended up rotated 90 degees from what it should be, but that bloody noise is gone! (It was getting worse). Thanks again- it sometimes seems that there are about five people in the entire world who've got a handle on these cars!