Sorry Gibbo but you are wrong for the 1.6Hdi 407. On this the fuel filter is at the back of the engine bay to the right of the priming bulb on top and just in front of the EGR valve as you look from the front of the car. Nowhere near the battery. Perhaps you mean the 2ltr.Its to the left of the battery. Take out the battery and you should see it tucked away under the air piping. That's certainly the case on the 1.6 407.
Search Ebay for a pic so you know what you're looking for.