Hi all, I had to be recovered from my journey to work yesterday. I've got a 2009 1.4 jdtm. Driving on the motorway it developed a knocking noise, loud metal on metal. This got worse over about half a mile. Now the breakdown guy said it could be the camshaft and followers. The engine still starts and runs ok, other than the loud knocking. It's not missing. So if it was the camshaft or timing belt I assume it wouldn't run or it would be lumpy. Any thoughts?