I have noticed that 100% of the properties in both CV34 6TN and CV34 6HY are connected to this cabinet. Could this be any extra leverage?
It certainly means there are whole postcodes which must be coloured white - unless VM happens to cover them.
Being white, CSW should include them in the scope of their project, though that doesn't guarantee you will get an upgrade.
If this is a change from their previous records, they might not be at liberty to make changes to the phase 1 contract, and can only add you into the phase 2 contract.
It is certainly worth asking CSW