How much does a new head gasket and cam belt cost on a Peugeot 306 106 diesel?

thinking of getting a 306 but hear they have alot of head gasket truble. i will also change the cam belt so need to no how much that is. uk only pleaseHow much does a new head gasket and cam belt cost on a Peugeot 306 106 diesel?it shouldn't be over 80 euros. if it is then check around for cheaper