Down on power, won't rev past 5k rpm

Hi all, I've just had my 1.4 Duratec engined 2006 fiesta serviced with new filters (air, oil, fuel cabin) and oil along with a new timing belt and a waterpump. Since this the car has been feeling sluggish past about 2.5k rpm, and feels like it's running out of 'steam' especially towards 5k rpm where it refuses to rev any further no matter what gear you are in (including neutral).

If anyone has any clue what could be going on it'd be greatly appreciated as other than this the car is nearly in perfect condition and runs pretty well.