Looks like the cavity trays were too low or missing and they have been addressed which is good, especially for an external soffit.
It would seem no cavity insulation is installed but this will (should) be blown in before drylining.
As for the mortar colour, this may weather down (eventually) or it could be tinted. Tea is good for darkening.
Please ensure you have your new home professionally inspected and snagged before you legally complete.
You will need to have the cavity insulation checked by boroscope camera.