I’ve still to speak to the dealer, will do that first thing tomorrow.
I’ve also noticed it is particularly loud outside. The noise appears to be coming from the lower front of the bonnet.
The dealer originally told me this is normal and is only heard in the AMG/i4 version. Apparently is has different power steering from the v6 - “it’s the same as McLaren use” as if that would help make the noise any less annoying.
Others I know with an i4 don’t have this noise, I’m going to...