Had a vectra b in today, with coolant loss, found the leak #4 cylinder spark plug hole was brimming with coolant. This is the second case of this in 3 months, cost of a recon head (inc valves), bolts and headgasket set £630, plus labour +vat. I pulled the plug cap of the coil pack and it had just started to corrode so in a few weeks a misfire would have started. Has anyone come accros this before or are we a lucky garage ??????