Just to give you an indication if it does turn out to be the head gasket and you want to cut your losses and sell it. 3 year old Ford KAs start at about ?2500. If you put it on E-bay, properly described as a car that needs a new head gasket you should get anywhere between ?1500 - ?2000 (just an indication here from what I recently sold a punto with a shot head gasket for) A garage will charge you anywhere from ?500 - ?1000 to replace it. More than likely they will quote you about ?600 and end up trying to charge you ?900.