Ford Mondeo mondeo 2.0 tdci 2005 not starting well when engine is hot.

Hi, can anyone advise,my mondeo a 2.0 tdci estate runs like a dream apart from when the engine is hot and will not start until the 2nd or 3rd attempt. I have had the fuel filter change, a new camshaft sensor. Injectors and pump all working and no excessive smoke, my fuel consumption is still good and no loss of power, I have been advised that it could the turbo arm jamming on, has anyone heard of this and would this mean a new turbo, Its a taxi and has 111,109 miles on the clock. thanks claire.