BMW 530D diesel - ropey start up

[Cyrus1971]

70K Miles F10 530D and each morning starting from a cold engine (even in the summer) the vibration of the engine is awful. Really rattly and not musical like it is normally. Pull away and put some revs in it for 5 seconds and then the engine immediately balances itself out and runs like a kitten ? Not due any services according to the computer so was wondering on the possible causes ? Any advice appreciated.

[HughG]

I would guess one (or more) duff glow plugs. You can check them by removing them and measuring their resistance.