I took my car to BMW 2 weeks ago for the security sofeware update and they said there was a recall outstanding on my car for the injector. Thats the cause of the juddering and jerkiness in low gears
As part of the recall BMW have changed 3 injectors, 6 Buffers & 3 Gasket Rings. That was £600 pounds worth of work paid by BMW HQ.
The jerkyness in low gears is solved but its still slightly juddery on idle but that doesnt bother me that much, lets me know that I'm sat behind a powerful machine!