Many thanks for your help, @FridgeFreezer & kiwi_110.
I have also spoken to a LR expert who has informed me that the Fuel Tank Pump and the Fuel Rail Pressure Sensor are the first possible suspects.
He has asked that I use a diagonostics computer to measure the fuel pressure and should it be less than 60,000 KPA then, the pump needs changing.
I have also read somewhere that a known fault is the corrusion of the Fuel Rail Pressure Sensor connector which may need replacement / cleaning.
Gosh, didn't realise there could be so may components attributing to the problem.
After discussions with the LR expert and taking into account all the possible clues you have provided, I have decided to carry out my diagnosis in the following order:
Check and repair / replace:
1) Fuel tank pump;
2) Fuel Rail Pressure Sensor 7 & conenctor;
3) PVC;
4) EGR Valve;
5) Intercoolant hoses;
6) MAF & sensor;
7) Under-bonnet fuel pump;
8) Turbo horses, turbor vacuum pipe, turbor actuator valves.
It's a rather long list but I am happy and confident somewhere in there lays a solution.
I am hoping (1) & (2) are the protagonists and therefore will not have to go through the entire list.
On the advice of the LR expert I will now include checks of the PVC and EGR valve when servicing the vehicle.
I am currently in the UK but will use your valuble advice as soon as I return to the Caribbean and will provide feedback.
Thanks guys for taking the time to share you knowledge.
Cannot wait now to let you know th outcome.
Cheers.