Excellent info!

If that doesn't cure things, next I'll try pulling codes - found this excellent site http://pages.prodigy.net/jforgione/MB_DM.html doing a search on Read ABS Codes here on mercedesshop.

And the darling wife says to say thanks to each of you for your quick replies - and that she will keep her "nah nah nah I was right!" dance at a reasonably low level of intensity until such time that we confirm your suspicions

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1961 220b: first project car - sold.
2000 CLK 430: first modern Benz - sold.
2001 CLK 55: OMG the torque!!! - sold
1972 280SE 4.5: Baby Gustav
1991 300TE 4Matic: Gretel the Snow Bunny - sold
1978 300SD: Katz the Free Man - given away
1980 Redhead: Darling Wife