cam belt

[rooster]

At the last service, 60,000, my skoda main dealer told me the cam belt should be changed at 100,000 miles, when I asked.
Now, at 70,000 a former skoda dealer (now daihatsu, like several smaller ex skoda dealers) tells me it should be changed every 5 years irrespective of mileage. he also told me to have the water pump changed at the same time. Including the service he estimates he will charge about £350 for all the work.
Is he right about the work to be done and does the charge sound reasonable?

Oh and it is an Octavia 1.6 petrol