A fresh Red Admiral butterfly (above left, February), a more faded specimen (above right) and a darker individual (below right).
They used to be all immigrants to UK but now, with warmer winters, some may hibernate here through the winter.
Above photo of Red Admiral by Bob Clark (2006) and included with his permission.
Another Red Admiral by Bob Clark (2007); how does he coax these butterflies onto his hand?
FOREIGN RED ADMIRALS:
Tenerife variant Red Admiral Vanessa vulcania: less white on wingtips, darker red, more black on red bands -- more like chain links than red band.
Both versions of Red Admiral, atalanta and vulcania (appropriately) can be found on Tenerife.