Vapourer Moth
Orgyia antiqua
The "eyes" are to scare predators.
Wingspan 25-30mm; UK flight time Jul-Sep.
Although these photos were taken at night, he can also be seen flying in daytime.
The male vapourer moth has wings and feathered antennae so he can find the wingless female who stays near her pupal cocoon most of her adult life.
VAPOURER CATERPILLAR