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I have recently cured a similar sounding vibration on another classic (Volvo Amazon) by correcting the prop shaft phasing. This involves making sure that the front and rear yokes are in the same orientation, and have not gone "out of phase" by being incorrectly reassembled at the central spline.
Not sure if this is relevant on a Dolomite but it is a simple fix and may be worth a try if your yokes are not aligned.
A Dolomite has a split prop too and, as with the Volvo, out of phase means out of balance too! This could certainly cause the problem and there is nothing to see apart from the misalignment of the UJs - which is easily missed!
Steve