I have noticed mine can be occasionally a bit rattly in the cold, have new clutch recently fitted, so shouldn't be the clutch on mine.
On mine I have put it down to the diesel waxing up a bit in these extremely cold conditions and that this inturn was causing the injectors to operate at 100%.
Have heard the injectors being out can make the engine rattly?
Just my 2 penneth Jon.
Member No. 143
Mods so far: LED sidelights, interior lights and number plate lamps, Rover Xenon Headlights, Kenlowe Fan, Synergy 2 and EGR Bypass