Quote from Permafrost ATPL:
"Unless it's an older 319 model, where the NWS was powered by the Green system."
Can't comment on later hulls in the A320 family, but G-EUPM is an A319-100 series with L/G and NWS powered by the Green hydraulic system.
Ground-Spoilers 1 & 5 use Green, 3 use Blue, and 2 & 4 use Yellow.
Slats use Green and/or Blue; Flaps use Green and/or Yellow.
Green system is pressurised by #1 engine ED pump or the PTU (RMP) from Yellow.
Blue system is pressurised by an AC pump or, in emergency, the RAT.
Yellow system is pressurised by #2 engine ED pump, the PTU (RMP) from Green, or an AC pump.