Moderator: RichardW
I'm willing to bet that changing the EGR valve on this is challenging to say the least - given that most of the engine is buried under the scuttle I suspect the clamp is all but inaccessible.....
Been running OK the last few weeks (I've been using it for work), but depol light has been on most of this week. Lexia'd it last night and sure enough EGR faults. Checked the live data, and the reported position is all over the place compared to what it's supposed to be. By contrast, the 307 EGR reported position is spot on with the requested position, so I think it's definitely up the swanny. Unsure whether cleaning it will be enough, or if if will need a replacement - any one got any thoughts? Looks like a mare to replace on this installation (most of the engine is buried under the scuttle), so might be best to just replace it - although I remember Lighty saying that the cheap ones on e-bay were hit and miss, and a pukka one is £350 or so.... 
I have read somewhere that knackered EGR was causing the handbrake fault on one car, presumably by pulling the signal voltage down, so changing it might fix the handbrake 'fault' as well - the ABS ECU can see the engine speed no problem on Lexia. 
). I found a fault diagnosis against one of the EGR codes, and it says one of the effects is disabling the auto park brake (can't find it again though!). So it looks perhaps that the handbrake is just a red herring, and it's been the EGR all along. I might have a look at the connector, and the ECU connectors - can probably get the connector just by taking the fuel filter out. I've seen genuine valves on the bay for £95 - it doesn't seem that cleaning the electro mechanical ones is easy / successful. Got to sort it as it's pretty well a permanent fault now, and it won't MOT with the ESP light on.
Had to remove the battery cover so that there was enough room to remove the air box - it was getting in the way of getting the clamp off. Even with the proper pliers this was awkward, and I doubt it could be re-used. When you undo the bolts, keep a hold of the gasket, otherwise it disappears down the back of the engine never to be seen again (new one only 50p though)! Getting the bolt started in the new clamp will try your skills of manual dexterity whilst reaching over / around the engine! Faults cleared, and now the position tracks the requested position closely. Took the top off the old valve - there was a fair amount of soot in the top part where the actuator goes onto the valve spindle, but it certainly wasn't stuck. Been out for a few miles and all lights stayed off - but then it did that last time I had the battery off....
The idle is slightly rough sometimes, which it wasn't before, but I can live with that if it's not beeping at us all the time, and in danger of failing an MOT! Seems to have lessened through the week anyway.