May not be as bad as you think. How far and hard did you drive it home? It was a hot day round here today. It could be clogged radiator, or sticky thermostat, or water pump, before you get to head gasket. How did you find the vendor, if e-bay they offer a refund scheme from Pay-Pal payments. The Police would only be interested if criminality was involved, even then they might not do anything, too understaffed. Trading Standards could do something but only if a False Description had bee applied and you could prove it.Land Rovers like you to love them, and to show it; you may well love to forgive its little needs. Perhaps: I adore my P38 but I keep have to remind myself that someone very rich first owned it, and paid to have its little problems fixed!