The CWT on the 'A' market aircraft is just the cheek tanks on the inbd section of the wings and joined across ship with 2 large diameter tubes. On the 'B' market aircraft the whole of the centre wing section (and the cheek tanks) make up the CWT.
The CWT pumps will transfer out below 1 tonne (especially) in the air due to the natural flying angle. The remainder of the fuel will be aspirated out by the motive flow jet pumps from the wing tank boost pumps.