I am suprised that know one has brought up the....
"We have the traffic on TCAS"
Leftbass The request to confirm the landing clearance is purely a CRM thing. In our landing checklist the cleared to land/runway clear check is the last item. The second last action is at 500ft agl. So if anyone has missed or not sure, even if one person is 100% sure it has been given I have always been taught to check. I reckon my memory lasts about 4 miles, 2 miles if the wx is horrible.