As posted in the Scarlet Band thread - they have indeed won the contract to operate the Durham Park & Ride services, with new vehicles required.
The fall out from this will mean that the 10 Solo's in the Arriva fleet that currently operate it will be no longer required after service on 26th October. I am told that 2852-2861 are leased though, and therefore they will simply return to the leasing company (whoever that may be, I have a feeling it may be Mistral) and will not be available for cascade elsewhere.