Land Rover Repair: Defender 110. Diesel, 2010 model, diesel conditioner, fuel contamination

Question
When night temperature in  winter fall to -2  to -5  degrees C car  start  in morning and travel 50 m  and then cut  out. If  sun  is  up   for   few hours only  it start  again. Two   other  diesel cars next  to  this   one is  fine  and summer  is also fine. Landrover  find   nothing  wrong with engine ? Why  will   this  be   and can it  be water  in diesel   filter  that freeze and limit  diesel  flow ?

Answer
On a late model car the most common reason for failure to start when cold is indeed fuel contamination.  You may have to pump the tank empty and put in fresh diesel.  If Land Rover says the engine is all right, that is likely the next step.  

You might try driving the vehicle till the low fuel light comes on, then go 20 more miles, and fill with fresh diesel and a bottle of strong diesel conditioner.  See if that does not cure your trouble