For anyone who is interested, it was the Window Regulator as I suspected.....

David.

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Connecting Via Two Tin Cans and piece of String

Current:-
'02 ML320 '00 Jaguar XK8 '97 Jaguar XJ6

Previous:-
'00 ML320 '97 C230 '94 C280
Jaguar '93 XJ6 VDP
BMW '96 328i, '93 318is
Lancia '93 Thema Turbo, '91 Thema
More Fiat X1/9s than I should admit to
Citroen '86 Visa Gti