Great team effort! So plaudits to Mark, Mark, Igor and Neil.
Apologies for my absence in this very relevant thread. Way too many hours under the rear of the car due to the diff oil leak. All well and good now, I've even managed to sneak in some of the promised upgrades. The car now reads oil pressure/water temp on one gauge and engine oil/gearbox oil temps on the other. all wired up and ready for the track day test. Have been investigating the oil stats and gearbox oil cooling system in the meantime. Well done to Neil for his guidance and Mark W for pushing me the right direction to accomplish this and also for forwarding our project to the relevant people at Caterham Cars. Let us hope that something good comes out of this.