Viktoria, my 1974 Volvo 164E, is back in my care again today.
Seems that the ignition coil burnt out the condenser in the distributor and so the points eventually failed. Fuel was fine.
Apparently the ignition coil should have been swapped with a non-electronic ignition one when we put points in (news to me).
New coil (Bosch GT40) is in there together with a new condenser.
Drove home fine. Hopeful this is the end of this run of bad luck with Viktoria.