Right,I went to the garage yesterday and here are the findings.
To start with, the Airflow Meter is faulty and not fueling the engine properly. This is why it sometimes feels like it is missing even though it isn't.
The AFM was disconnected so that the engine ran in default mode and there was a slight improvement in vibration so that is the first thing to be changed, although Land Rover want £430+vat, so I will be looking on ebay.
With regards to the main vibration prob, the crankshaft front damper is suspected. I hope this is the case because other than that it could be a problem with the torque converter that did not show up when I put the transfer box in nuetral because it was not under load.
I will be having a new radiator soon, (yes my problems are like buses, all come at the same time), so while the radiator is off the damper can be checked.
If this cures the problem I will let you all know otherwise I might go back to a td5.