Here's an old male (centre) -
And here's the site, centre, from a distance. The rides in this pine wood were lined with highly suitable-looking sallows but we didn't see any Emperors there, maybe the butterfly simply hasn't found these isolated rides yet.
In the afternoon we watched Lesser Purple Emperor males behaving appallingly - every bit as badly as Purple Emperor males - clashing and chasing, from perching points on birch and sallow along a shady leeward edge (it was quite windy) in 30 Celsius -