Small Yellow Underwing Moth

They have lovely bright yellow underwings, which they often sit with in view. This guy just wouldn't cooperate.

Update: I found my self quite shocked when I saw this little moth, at how small the Burnet Companion had become since the last time I saw it (a quite common phenomenon when shooting macro shots..lol)
Today we saw a True Burnet Companion and he was the size I had expected so I had to rethink what this was.