Well, finally, received the SCB100211 ECU yesterday, plugged in and guess what ..........
IT WORKS !!!!
Flick on SET in steering wheel, then raise + and speed increases by 1mph increments unless held on, raises until switch let go. Dab brakes, cruise drops out, flick either + to resume what speed vehicle is now at or hold + to increase again. Move RES other way, cruise cancelled until RES is initiated again. Hit RES twice, cruise is switched off. Cruise master switch needs to be depressed to enable cruise again.
Happy as complete cost under £100, and all wiring was in place, only bought master switch, steering wheel switches & 2nd hand ECU, doddle to fit.
Note, if new ECU purchased, and found some for £130 at dealers, they need to be programmed on Testbook T4 at L.R.Dealers before they will operate, 2nd hand ones are already enabled.