Does the 1.5 / 1.6 BlueHDi have a timing belt or a chain?
The 1.5 / 1.6 BlueHDi used by Peugeot, Citroën, Vauxhall, Toyota (2013 onwards) runs a dry timing belt. Dry belt, but change the water pump at the same time — a seized pump takes the belt with it.