We've just returned from a weekend in Norfolk, where we visited Hickling Broad, a wonderful reserve run by the Norfolk Wildlife Trust, and one of the few places to see Swallowtail butterflies.
Our first sighting was the briefest of encounters when one zipped across the path in front of me, and we assumed that was probably as good as it would get until we reached a warm sheltered boardwalk bordered with tall reeds and grasses and occasional patches of Yellow Flag Iris. Here we watched half a dozen swoop across the reed beds, disappearing for minutes before taking to the air again and virtually impossible to photograph. A passing warden recommended that we keep our eyes focussed on the Yellow Flag Iris a favourite nectar source of the butterfly and a potential resting spot.
And eventually, after a considerable number of obscured shots, I managed to get one reasonably clear view, phew!