Thanks for replying mk2 , I thought it might have been but no oil discolouration and no sign of a leak around the engine, so didn't know, I don't think condensation would empty the expansion tank as fast as it's draining,and I usually run it for around 2hours, it's been a long time since I changed a head gasket,that was on a ,mini clubman, 20ish years ago, have things changed much? Or would you recommend taking it to be sorted out, thanks for the welcome, and thankyou for helping, Sally.