Thank you for your help and my appologies for the dalay in replying. The battery only goes flat when the car is unlocked. As you say I suspected that somthing was drawing current but wasent sure if it would something like the fuel pump but not being familiar with not only the car but desils in general, could the glow plugs also be an issue due to the fact that the current being drawn must be quite high due to the rappid discharging?
Glow plugs could be an issue but they of course mean that your start circuits are live even without turning the key. I'm quite new to having a diesel but I believe that if it were the case that something around the glow plugs ought to feel at least a little warm