[s-type] Is my gearbox "lurching" 2004 2.7D

Have 2004 2.7 diesel auto. Driving the car it seems to hesitate,
sort of holding back, then pulling, holding back then pulling. I
can watch the tacho needle dropping between 250/500rpm then up
again/down again/up again!! I noticed my wife in the passenger seat
almost rocking back and forth in time to the problem. I’m finding
it bloody off-putting…I’ve seen a couple of other posts about
this ‘‘lurching’’ but they seem to be when slowing down? Can anyone
shed some light on this please–
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