EasyJet I think have 21 in MXP but not sure on the A319 v A320 split.
Some debate as to how many LTN has for S17 but around 20ish, again not sure on the split.
STN is 6x A319s and 1x A320.
SEN is the smallest with 3x A319
GLA has 4x based and LPL 7x based but again not sure on the breakdown of A319s v A320s but both definitely have a mixture.