Large wasp or Hornet?

Large wasp or Hornet?

Observation - Large wasp or Hornet? - UK and Ireland. Description: This amazing wasp suddenly appeared on my garden wall. It was so big that when I saw it out of the c

This amazing wasp suddenly appeared on my garden wall. It was so big that when I saw it out of the corner of my eye, I thought it must be a dragonfly. The pencil is for scale.