I would say car goes well if I floor it, but under normal day to day driving it does seem noticably sluggish.

Also noticed economy getting worse. Used to get mid 50s now last tank was down to mid 40s. 99% motorway commuting at 70mph.

With no warning lights showing,it may be there are software updates available to resolve your issues.A friend has a similar car and was finding it difficult to drive smoothly with hesitation problems.Ford dealer said the ecu was at least 7 updates out of date and new software transformed the cars performance.

I'd second this. I had a Mondeo TDCI 140 for over 3 years, mine was a 2008 (built around 9 months after the car was introduced) and had no driveability issues, but the Ford forums had lots of posts about problems with earlier cars, especially the 1.8.

I seem to remember similar issues being reported when the 163bhp version was introduced, some owners were reporting inconsistent performance.

Have a browse of the TalkFord forums in the Mondeo/diesel section.