Long story short, most of the diesel in the fuel filter (less than 1/5 litre) leaked directly down onto the parts installed beneath it. I had failed to notice that the rubber drain pipe was missing, that would have directed the diesel down towards the floor, where I had a catch tray waiting
Most of the diesel seems to have collected in a metal strut / bracket several inches below, but there are too many actual parts in the way of it to see for sure.
The fuel supply and return hoses (one of them) caught a bit of the leak too.
Does anyone know if there are any parts under the filter which will be critical to clean later?
2008 Xsara Picasso btw
Thanks