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The male rests with the tip of the abdomen curled upwards which is probably the 'bump' you saw on its back.
My first post by the way!
Yeah i can also confirm that this is a Small Phoenix, i have these in my Moth trap all the time. I love these Moths, they have so much detail!
The forewings of this moth are brown to blackish-brown with a black band across the centre of the wings. This is divided by pale lines.
Welcome to iSpot Phil, and agree that Small Pheonix is a smart moth!
Entomologist and biological recorder
I was very unsure of this after looking at many, many images. So it is Small Phoenix.
Thank you all
Lat/Lng: 51.3, -4.4
OS grid ref: SS3366