I guess it could work like this:

637, 638 and 639 transfer to Percy Main due to loss of 516, and PVR reduction of 237/238.

648-652 allocated to 40/41 (I think it has PVR of 5?)

653/654 transfer to Peterlee - 718-720 to Percy Main (less spares required due to loss of X6/X7)

672-678 transfer to Deptford for X6/X7/X20 - 691-694 transfer to Percy Main, allocated to the 19 (PVR 4)

679, 680, 681, 689 and 690 move to Washington, releases 701-705. These can be allocated to the 11, with 1 spare. (PVR 4) - Omnicities transfer to Riverside.

709 allocated to W2 as present.

718/19 allocated to W1/W1A. (720 spare for W1/W1A/W2)

625, 627, 631, 632, 637, 638, 639 724, 725 (withdrawal of 18) are left for the 42/42A

The Eclipses are kept for spares for Misc services etc. I don't want to loose all of the newer Solos on the indiGo North Tyne, but it seems pretty inevitable. 

I've probably done something wrong but it seems to work to get Percy Main fully Solo operated. I dont think they would put Streetlites on the 11.