Thanks Lydia
In fact I think a correct reading of A29WP169 shows that the ICO statement I was challenging is indeed nonsense.
e.g. at P19 "joint control will arise when different parties determine with regard to specific processing operations either the purpose or those essential elements of the means which characterize a controller" clearly is a direct contradiction of ICO saying that if one party determines his own purpose it cannot be "joint" control
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