It's back again.
Summer driving and no problems. Get to winter and the car for the first 5 mins is lumpy. As you pull away the car feels like it's jerking every 5 seconds or so. Give it 5 mins and the problem has gone. But more noticeable on acceleration rather than cruising.
Bmw had it last year and could not detect the problem and plugged in diagnostics. But it's fine in the summer.
BMW F10 520d M Sport: Paddle Auto Box, Heated Front/Rear Seats, Professional Sat Nav, Heated Steering Wheel, Pedestrian Protection, Integral Active Steering, Dual Zone Climate Front/Rear, Adaptive Headlights, BMW Online