Yes Janice, I've seen these around. Might be my imagination, but they seem quite 'friendly' in the sense they hang around rather than fly off quickly when they sense movement.According to an acquaintance who is a butterfly expert - conditions have led to a bumper year.
Lot of these around (this one is on the field opposite but they are in gardens as well).
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Called "gatekeepers"
We have "small whites" as well