http://www.therailwaycentre.com/
the link above shows 150010 as a 2 car set, maybe it due to maintainence - the centre cars of the 150/0 are to be transferred to Northern Rail.
As far as i understand:
a) 150101, 102, 104, 106, 108, 122, 124, 125, 126 & 132 are to go to FGW.
b) 150202*, 204*, 206*, 210*, 214, 216, 220* & 226* are to go to Northern (* = still acting centre cars at present time).
c) After the centre cars of the hyrbid class 150/0 have been removed the units will revert back to 150/1, but as to which operator they go to is still to be sorted.
d) 150016 & 150017 have 57 odd centre cars as the 52 cars were scrapped due to crashes so i think these two units along with 150001 & 150002 are staying with London Midland.
A couple of weeks ago 150017 was running around as a 2 car set, so i think if the 150/2 centre car gains a fault they remove it from the set so at least 2 carriages are still running in service rather than the full 3 carriages been out of service at the depot.