Ok, Got the P38 2.5 DT (203k miles R reg) so far it has run as expected (slowly doing approx. 700 motorway miles a week) since I got it, it has been difficult to start, I went out the other morning and it was turning over but refusing to start (getting just about there but not quite) and ran the battery down , so charged it up and eventually, after a fair bit of turning over it started, but there is now a knocking from the engine it reminds me of knackered big end bearings but coming from the top end and louder towards the front, this 'knocking' goes away at 1250 revs and it then just sounds like a normal diesel engine (well as normal as a 2.5 DT will get) also the knocking doesn't get any faster as the revs increase to 1250, I had already glow plugs so when they arrived I fitted them and now the car starts a whole lot better (but still the knocking) and, being the brave (stupid) sole that I am took it for a thirty mile run, where it drove as it usually does (slowly but gets your there) but knocking still there (a lot quieter with the bonnet down) any 2.5 diesel experts out there got any ideas?