Its behind the passenger compartment glovebox. Its a black module with 4 or 5 electrical connectors going into it.
 
If anyone ever needs to know-
Remove glovebox & lower shroud which is made of card.Behind it there are 3 modules.The BCU is the middle one, black plastic housing.It has 4 multi plugs (grey & yellow) along the base & one in the left side of it (brown).It is held in by one securing bolt which passes through the unit horizontally.Remove this & it slides out.
 

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