On the whole, I agree that is a measured and reasonable letter.
However, it contradicts a number of points made in previous communications, and quite clearly states the the DVSA cannot and will not act without the manufacturer's permission; that being apparently just one man in a global organisation. "Reasonable time to act" clearly exceeds 12 months, so might as well be forever. Leave issues at the manufacturer are clearly stated as being beyond the DVSA control, and they hint that the process will be paused until such matters are resolved - no hint of deadlines whatsoever.
I'm appalled at the light touch this public body exerts over the manufacturers - it truly is virtually worthless.
I can only imagine that there cannot be a decision of critical safety issue to come from this, otherwise surely the DVSA wouldn't accept it being moved on at the whim of literally just one chap in an Italian (I assume) office?
And I agree they've made up the point about noise being a forewarning of the potential failure.