Try the pictures (thanks to camelback1998) of the CRD engine out of the vehicle at
http://www.flickr.com/photos/68442076@N ... hotostream That link should take you to a picture of a plug in the oil gallery near the turbo but if you click on the "older" tab you can see a couple of pictures of the passenger side of the engine. From your description the heat shield you mention is on the left about 1/2 way down the block.
PLEASE send me a picture of the area behind that heat shield showing the oil plug behind the heat shield and if you can some idea of the amount of clearance available. geordi and I are exploring the idea of putting an oil pressure sending unit in one of those plugs instead of the OEM location which only looses pressure after it's too late for your engine/tranny. If you are like me an don't know how to attach a picture to a forum email either post it on this chat, if you can, or email me via the forum and I'll send you my direct email for a copy.