Cityjet could work operationally well in some ways at WAT, given the closure of LCY at 1230 on Saturdays until Sunday at 1230, a departure to WAT SAT morning could do 2 weekend sorties to say Faro and Malaga from WAT and then be back into LCY from WAT on Sun pm to meet the Sunday evening demand ex LCY.
However, given WXs challenges I just cannot see them starting an operation at WAT....