Just as a bit of whimsy, were mk2s ever portion worked? I'm kind of used to fixed rakes and mine will be running as such however I was pondering this the other day. Since I grew up on and around the Southern Region, portion working of EMUs is commonplace there. I know LHCS is a lot more complicated to shunt around and I'm told there are certain rules around reversing over pointwork with passengers on, however it's not unheard of.