A film of oil is collecting around the bottom drivers side corner of the radiator and over the connecting pipe from the thermostat. With the grill off it can be seen extending up the sheet metal side cover for the radiators assembly to around half way up the fans.
I reckon the most likely source is the transmission oil cooler.
Whats the best way to get at things so I can see if the leak is on the radiator itself, connection or pipe. RAVE implies that you can see straight in once the grill is off but I'm blowed if I can see the source. Be nice if it were just the O ring seal but that is probably way too optimistic. If I do have to change the cooler is it a drain the transmission job or can it be done with minimal oil loss by setting the car nose up so only the cooler contents escape and topping up the transmission afterwards?
If it is the cooler which brand to choose? LR Direct have Britpart £100, Allmakes £150, Land Rover £250 approximately.
On a related note does anyone have a feel for how many of those nylon nut thingies that take the grill fixing screws are used on the P38. Part CZK3264L. I need new ones for the grill but, at 20p each, its awfully tempting to get a decent bunch for stock. All the suppliers say used in various places but give no idea how many or how various. Got a thing about not reusing over age plastic stuff if at all possible. £10 or £20 worth on top of my next parts order is hardly going to break the bank but no point in getting 3 cars worth!