My Caithnessian is not good enough to know what a "hairy brottag" is but I assume that it is a caterpillar. The Convolvulus Hawkmoth is a migrant from continental Europe and it is highly unlikely that it can breed successfully in UK, certainly any caterpillars would not survive into adulthood. Highlander's moth has travelled a great distance before knocking at her window and like all travellers should be given an hospitable Caithnessian welcome!
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