Redsetter, Tinribs, thanks for the details on sight usage. PR00ne, the only reason I inquired about the T.19 having them was to see if they were possibly leftover from the T.11 days. As it has now been made clear, they were indeed removed.
WD935 sounds interesting. Les Bywater's old site has this to say on it:
CANBERRA - B.2 - WD935
Shows it was involved in the Red Dean trials which might account for that extra weight. Also a shot of it in the old Bomber Command scheme you mentioned.