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I'm not familar with P. giganteana, but your moth looks OK for that species. In "Moths of the Bristol region", the species is described as "possibly extinct". If you aren't in touch already, it might be worth letting Ray Barnett at Bristol City Museum know of the record.
Thank you very much for your comment. We will let Ray Barnett know as we are with the Bristol and District Moth Group.
Irene and Tim
Lat/Lng: 51.4, -2.6
OS grid ref: ST6071