I think "moved" over simplifies the current situation. A lot of turbos have been to Bristol, worked in passenger service and then returned to Reading where they work for a bit and in some cases (e.g 165134) then go back to Bristol again. The situation is very fluid. I am not claiming this as a definitive list but I think currently;
166 (all RHM)
RDG 166201,203,215,217,221
SPM 166202,204-214,216,218-220
165 2-car
RHM
SPM 165119,122,127,129,131,132,134
Non RHM
RDG 165118,121,123-126,128,130,133,135-137
Wolverton 165120
With air-cooling 165118,119,123-125,128,130,131,134-137
Without air-cooling 165121,122,126,127,129,132,133
165 3-car (all non RHM)
RDG 165101,102,104-114,116,117
Wolverton 165103
With air-cooling 165110,116,117
Without air-cooling 165101,102,104-109,111-114
I welcome any corrections to mistakes I may have made.