Depot rumour has it that the all the earmarked three car units will be supplied in that formation. Someone quite senior did tell me not to expect intermediate DKS▸ positions with refurb though, due to cost constraints. Again, only word of mouth and not an indication of official policy.
With regard to reversing the DKS on 143s. yes please, especially if we are to 'retain' a pair in the Brizzle area to work SVB services.
Depot rumor is wrong regarding 150 formations. Think it's supposedly 6 x 150/1 in two car formations.
ATW▸ / Northern to recieve the 150/2 vehicles. The only 150/0 three cars that will stay as is are 150001 and 002, possibly also the two with the unpaired 150/2 centre cars.
The centre cars of 150001 and 002 are incompatible with other class 150's as they have
EMU▸ / Pacer type gangway connections and Bar couplers
As for 143's they will be allox to 83C for maintainance but 4 sets head toward Bristol each day for WSM-Parkways and the Severn beach line. Hopefully saving taxis running up and down the M5 into the bargain......