All these people with shedloads of dosh in this day and age..........
Looking at the excellent observations above and Barry's equally excellent technical backup I think I know what the main cause of my MC problems are with the Croft and Ortofon T5's (with Sony badges on). Quality of reproduction aside, the gain at 20x (26db) is far too high and I suspect even 5x gain would be ok, although 10x would be better with matching volume control settings between CD and LP.
How much are the bent Audio trannies? I suspect a good few hundred quid, looking at them...
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me