head gasket blown?? Need HELP


I have a W Reg 1.0L Nissan Micra. It was loosing water due to a burst hose. I drove it to a petrol stration and filled it with water after about 10 mintutes. It no longer starts.The RAC guy said its the head gasket. My friend said I didnt let it cool for long enough.

Does anyone know of anywhere that would do a head gasket change for me on the cheap? I am based in Coventry, but can get the car towed anywhere round the midlands.