Just had the dreaded rattle from the Disa valve over the weekend. Easy to diagnose,unplug it and see if the noise stops................yep. Ordered one from my local stealer at 9.30 am, arrived 3pm,good service. Fitted in 10 mins by yours truly, a really easy fitting. Quick test drive, much smoother and quieter. It must have been getting very slowly worse as I hadn't noticed any rough running or noise until Saturday. Happy bunny that it was such an easy fix. not that pleased to be £ 148 worse off. Oh well!! 
