Definitely was getting misfire errors and bank this and bank that. They said to me it could be anything, vacuum leak, MAF, sensors, you name it but all the work was through AC cars at the time, so I presume they got it the parts including DISA from M&G.

Would have been a new genuine part anyway, along with everything else I changed! None of the error codes pointed towards the DISA though that's what makes me suspect that straight away when I saw the codes you mentioned.