2004 scenic 1.5dci hard to start hot or cold

Hi I'm new here although been here ages reading ! I've got a 04 grand scenic that runs perfect no loss of power idles fine but just a real torture to start it starts slightly better when cold I could drive it for 50 miles without a problem until I turn it off and strate away it's hard to start takes ages. It always eventually starts but it puts up a hell of a fight can any one help it shows no engine faults on reading just the handbrake witch I've learned to live with any help is more than welcome