Does the 1.4 / 1.6 Turbo (A14NET, B16) have a timing belt or a chain?
The 1.4 / 1.6 Turbo (A14NET, B16) used by Vauxhall, Opel (2009-2019) runs a dry timing belt. Short interval by modern standards and frequently missed on trade cars. Also check the thermostat housing for coolant weeping.