I also found and photographed one of these on 13th May 2007.
We tend to think of moths as being rather drab in colour compared to butterflies, and flying only at night, but there are some notable exceptions.
Last week we saw this Six-spot Burnet which had just emerged from its chrysalis.
The Burnets are also brightly coloured moths which fly by day.
The chrysalis is attached to a grass stem.
For an excellent picture of emerging Burnet Moths, see Colin Jacobs' blog