Citroen C-Crosser - Running problem - Biffa

My Citroen C Crosser 2.2 HDI has developed a slight hesitance when pulling up hill. Seems to start and run ok the rest of the time. Has recently had a full Citroen service. Any advice welcome.

Thanks

Citroen C-Crosser - Running problem - Gibbo_Wirral

What year and what sort of mileage and driving has it done?

Citroen C-Crosser - Running problem - Peter.N.

Did they change the fuel filter?