Feeding on Common Nettle, but it's not on that page in my old book, which lists them by food plant.
No interactions present.
As the list of interacting plants (above) shows, Garden Tiger feeds on a wide range of plants including nettle.
Entomologist and biological recorder
Correcting the identification.
Lat/Lng: 52.4515, -0.1889
OS grid ref: TL231852