Hornets in the roof

Removing some of the climber as part of the new roof revealed a European Hornet's (Vespa crabro) nest under the soffit board which is good to see as they are a useful insect to have around. What was puzzling was that just over a metre away was a wasps nest also under the soffit board. As I understood it Hornets will prey on wasps and so wasps will avoid building nests close to hornets. Maybe the wasps were there first.