Social wasp

Social wasp

Observation - Social wasp - UK and Ireland. Description: I think it may be a Tree wasp - face with a black dot, antennae yellow at the base, thorax with '2 yellow spots at the rear. The normally yellow areas appear grey on this wasp - why might this be?

I think it may be a Tree wasp - face with a black dot, antennae yellow at the base, thorax with '2 "yellow" spots at the rear. The normally yellow areas appear grey on this wasp - why might this be?