I think situation is now :
Wolverton currently has 10 units, some have been there months
175 (no 2 car units)
175 101, 102, 106, 107, 108, 111, 112, 113, 115, 116 (10 x 3 car)
Laira now has 4 sets that have passed through Wolverton & 4 training sets
175 001, 003, 006, 011 (4 x 2car with Wolverton updates)
175 002, 007, 009 (3x2 car for training)
175 114 (1x3car for training).
Still stored at Ely 8 units
175 004, 005, 010 (3 x 2car)
175 103, 104, 105, 109, 110 (5 x 3car)
and 175008 which is not formed as a unit
So only 8 of 68 vehicles (just 11.8%) have been through Wolverton