My better half has just picked up a full gasket set from GSF for our 1.9DG. It seems that the kit contains no tubes of sealant

GSF have the sealant for the Water seal gasket (Reinzosil?) but have no idea what spec of sealant we need for the Head nuts. Using the info here, all I know is that it's yellow

Can anyone confirm which type or brand of sealant I can use for the head nuts?
Cheers