Hmm, I think you are referring to the 'aileron upset' system (as in ailerons set 'up') which is turned on at certain weights and heights, to control spanwise lift load (and therefore the bending moment of the wing). I don't recall seeing any VC10-specific stuff on the web, but the C5 appears to have had a similar system described here:
http://ntrs.nasa.gov/archive/nasa/ca...1976024060.pdf
Try searching for 'active lift control' or 'active lift distribution control'. The
current VC10 lot will be along shortly, I'm sure, to give you the full gen on their system.
