Adding this for info: it would appear that the fluid pressure in the pipes to the cooler is approx 30psi, from here http://forum.landrovernet.com/showthread.php/194502-Range-Rover-Auto-Gearbox-Replacement!-EEEEK!!
One jubilee clip is OK with 40psi in my experience, but on a slightly flared pipe.
The pipes are each in 2 sections, 4 parts in total. I can get 3 parts but not NRC 9868. Parts are:
NRC 9868
NRC 9869
NRC 9870
NRC 9871
I might use flexible over the whole length, with manufactured fittings at each end,