SolarPlants quoted around that figure for the Perlight/Jinko panels with inverter and a cheaper battery.
LG320, SolarEdge, Sonnen 5kw batter: https://monosnap.com/file/oKuele8ixGrnmEGetzdbOgX8vgWuIg - £16, 468.40
JA295, SolarEdge, It says no batter, but it included one they...