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The engineer told us that yea, 100mm would be alright, just that builders and concretors, when they read 120 they'll cut it thin to 110 or 100 anyway so he spec 120 else they go to 80. Maybe he has a point, who knows.
He does not have a point. The engineers job is to specify, not to guess what the concretor will do. This is why the world is going to crap, the concretor charges for 120mm and only supplies 100mm,
with the aid of the engineer facilitating the fraud of a 20% rip off of the customer. One thing for sure, that same engineer would only specify 100mm for his own slab, because he does not like being ripped off himself, but it is alright for you to be ripped off.