After consulting my lists, there are currently 14 Washington Street Shuttle MPDs, so like-for-like replacement would leave only 2 Versas spare for Saltmeadows. Of course, that side of things will have to wait until the moves actually to see what happens.
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Indeed it is a PVR of 14 for the WSS.

4 for W5/W6 and I think, but not sure whether the M2/M3 uses 6 leaving 4 free or 8 and leaving 2 free, as the M2/M3 interwork, e.g. M2 coming into Heworth then turns into M3. The main reason why i'm unsure about the PVR of the M2/M3 is due to the frequency being decreased last year from every 10 to every 15 minutes.

Also on a daily basis there seems to be atleast 1 WSS on the M1 and a minimum of 2 on the 88/88A. On the flipside there is always a couple of deckers on the W5/W6/M2/M3.

I can't see the WSS MPD's being withdrawn just yet, especially the 53reg ones. I have a feeling some of them will go to Chester le Street for usage on the 71 which requires 2 buses and the 34/34A which requires 6. As for the other 6 I think they'll probs go to Peterlee to replace some of the 2000/01 batch of MPD's on the East Durham Network.

This would then lead to the withdrawal of the Lambton Worm DAF's and more SPD's/Older MPD's in the GNE fleet. This is just what I think may happen come June/July.