Was after but a considerable while after the BOV was fitted. My bad, it is a rubber grommet but I couldn\'t think of the right word at the time :-[
So where do I get said grommet please? And to clean it out and change it I apparently need to depressurize the coolant system? How do I do this (I know, real noob question but I\'m trying to learn the practical side of things lol )