I'm another gardener in South London who has seen the Jersey Tiger. I first saw one in 2010 which had found its way indoors: fortunately it was on a windowsill so it was easy to free it. I saw a couple in the garden again in summer 2011. Hope to see them this year.
I notice that another commenter mentioned the caterpillars eating comfrey. I grow comfrey for the fertiliser and also as a good bee plant but didn't know it was also useful for the moths.
