Range Rover 4.4 HSE hot start Problem

Hi everyone just joined the forum. I am living in Amsterdam and have a 2004 4.4 HSE (American spec) Range Rover. All is fine with the car until its gets hot and refuses to start without turning the engine over for some considerable time and having to pump the accelerator. Cold start is no problem and if the engine is re started within 5 mins whilst hot it starts first time. Left for over 10 mins then the beast struggles to start.

Has anyone got any clues as to why this happens

Phil 55