Electrical drain

[EvanR]

So my battery is nearing the end of it's life, which is annoying, but on the upside i'm getting very good at bump starting...

Anyway, are there any common faults that would cause an 07 2.0tdi sport wagon to drain the battery? I think it's more than likely to be just a senile battery but I don't want to spring on a new battery only to have it immediately sucked dry by my vampire of a car.

Any pointers for where to start would be much appreciated!