See underneath Tap Parts Description to see / buy Tap Parts for Franke Filter Flow Corinthian Kitchen Tap (and not the Franke Triflow Corinthian Kitchen Tap which takes different Tap Parts and can be found here).
Valve: Tap dripping from the Spout ? Guide to changing Valve here.
Brass Bush: Part surrounding the valve. More info here.
O Rings: Tap dripping where the spout meets the base of the Tap? Guide here.
Aerator: Found at the tip of the spout.