As I say, they were snapped up by a combination of FGW, EMT and SWT. Eight of the 3-car 158s became SWTs' 159/1s. Most of the others lost their centre cars and went to EMT, except for 158798 which is now working for FGW as a three car unit.
Eleven TPE 158s became South West Trains 158/8 two car fleet after refurbishment (158880-890), including the last unaccounted for three car units.
All of First Great Westerns' hybrid 3-car sets utilise one complete ex-TPE two car unit plus one carriage each from the former Virgin operated 158s.
The remainder of the two car TPE units are split between FGW and EMT.