Since it is now legal to stick cooking oil in ya tank (I believe you need to keep a log and receipte to show using less than a specific amount - couple of thousad letres I believe) - has anyone tried it?

Wouldn't work in a PD engine, the older non PD engines it might.

Dont do it, you will break your engine! PD (you have the 1.9 PD 130bhp?) engines are not designed to run on biodiesel or cooking oil.