starting problem mgzr diesel 115bhp

Please can someone help me! I've got a 03 mgzr diesel, it starts fine first thing in the morning but when I take it on a bit of a spin and leave it for a hour or so then go back to start it it just won't fire up just chucks out loads of white smoke and the battery runs out trying but then bump starts straight away. It doesn't really happen on short journeys. And no coeds. Has anyone had this problem if so please please help me!!

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