My dad has a Mk6 Escort 1.6 Ghia

Last night his cam belt snapped, ripped off the plastic casing.

He couldn't stop straight away as he was on a roundabout, but he pulled over as soon as he could.

It's being collected tomorrow and he's been told by his mechanic that they will try a new cam belt and see how it goes. Does that sound right? Im not technical, just doesn't sound right to me? Thought they'd have to strip it down and check the valves etc or is it easy have a quick glance?

Any help/suggestions much appreciated