Tackle

Hi All Partner has a 2015 Astra on around 87k miles. Sudden raid in engine temperature when she was out in it. She got it home (very short distance). I checked and alas, no water or oil, no idea how long for. I suspect Cylinder Head Gasket has gone, as when I filled the water reservoir, it began seeping from the side of the engine block. assuming we elect to get it back on the road, what is the Lilly cost? Are we in the hundreds or thousands? Thanks. Simon