This Bosch filter is a better fit than the MANN one I removed from the Focus. Quick delivery, and a genuine part for much less than many garages will charge.
It should take 15 minutes to fit - passenger footwell, remove cover, remove clipped-on panel, slide old filter out, slide new one in, reassemble. Refitting the panel over the filter is very tricky though - the knack is to align the top of the panel on the peg and carefully swing it until it fits positively, then click it back.
The TDCi Titanium has an extra wiring loom attached to the panel that makes this no fun at all. Thanks Ford.