help freelander td4 hard starting when hot

can some one help ...i own a freelander td4 kalahari station wagon its on 03/53 plate its done 43000 with fsh the problem is that it starts fine when cold once its been run for about 15 miles or so, i will stop the vehicle for about 5-10 mins then when i go to restart it the thing will turn over for what seems like ages then it will finally starts it seems to run as sweet as anything ive had the fault codes read and there is nothing in there can you suggest anything to cure it its driving me nuts and the wife wants me to get rid of it but i wont cheers by the way great website

got vehicle fixed at last had a leak off test carried out by jsf norwich and injector 2 was failing changed it for a cost of £290 and the vehicle is transformed so be warned if you get the symptoms i describe then this is what its likly to be not cheap