I have developed the same problem on my Td2.3 LWb
I have replaced the fuel pipes and fuel filter all to no avail. The other reports I have found is that the fuel tank breather pipes may be blocked or the fuel pump relay is in need of replacing.
I have got myself some easy start spray - take off the air filter and as you turn over the engine you spray up your air pipes towards you engine. Obvioulsy this is a TWO PERSON job as you cannot be in TWO places at once. You only need a very small squirt of the spray as well. This will not cure the problem but will help you fire up - Things that I have also checked is EARTHING ..... Make sure you battery has a VERY good earth .. might be worth while replacing or re locating the existing one as I have done. - Check your fuel filter ( replace it ) and all your fuel lines...... You may be asking for trouble if you let your fuel tank get dangerously low and this will pull of the cr*p from the bottom of the tank .... Quality of fuel could be reasons why the pipes could be getting blockages....
Loads of things here to try
thunderbelly
April 2008