A quick update, the You Tube video is spot on. The only thing on the Delta is that the battery is slightly in the way. other than that, access is a bit tight, but it's a straightforward, if fiddly job to remove, strip and clean the EGR valve. Mine was really coked up and needed a darn good clean. I had mine done start to finish, including resetting the fault codes and a good test run, in under 3 hours. Having done it once, I could probably do it quicker next time.