200tdi wots wrong with it (please help)

hi i have a 200tdi disco thats until now run sweet as a nut,
but now i have a problem. it randomley looses wot feels like the turbo
and misses, it blows out masses of white/ blue smoke and sounds like the bottom end has fallen out of it. the it will clear and is perfect, until it decides it wants to do it again

Hi m8 the first thing i would check is the fuel sedimenter, if its not been emptied for a while it may be letting some moisture through to your pump causing white fumes when burnt.
Regards Mark.