Thank you for your comment, TheMenace.
Following on from Lukasguy's earlier question asking at what RPM the vibration occurs, I went on a run this morning of about 15 kms (just under 9.5 miles). The road is more or less straight but undulates a fair bit, sort of like an "S" on its side.
Putting the car in 6th gear and on cruise control at 90 kms/hour (56 mph), and allowing it to manage the hills by itself, i.e. with no accelerator input from myself, then the vibration starts at around 1600 rpm and continues until about 1800 rpm, when the vibration tails off. This is pretty much the same in 5th gear and on an incline - not in terms of speed, but in terms of rpm.
In 4th gear and below, the vibration is harder to induce.
I'm beginning to think the turbo could be at the root of the vibration. This was changed in February 2020 as part of the particulate filter fiasco. With the most recent work, the garage insists that the only thing touched were the injectors and the fuel feed pipes, and they are therefore likely to dismiss a potential turbo issue as being the cause.
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