Great result from Clive's office, as always ... hope for good things to come from it, mate.
My thoughts are that they could link the unsurveyed premises to either of the 2 x PON's that sit on each side of them. There is capacity at both splitters.
From a desk-top survey point of view, it looks like childs play regarding duct hook-ups, but reality may be different with collapsed ducts, blockages etc .... either way, I'd remain positive if I were you. Most queries of this nature are generally complex in nature and costing.