Caddis Fly?

Caddis Fly?

Observation - Caddis Fly? - UK and Ireland. Description: This was attracted to the lights last night. I think it must be a caddis fly but can't really get any closer than that. The channel in the wood is about 10mm so the over body length must be around 15mm. Curious white mark towards the back. No streams near

This was attracted to the lights last night. I think it must be a caddis fly but can't really get any closer than that. The channel in the wood is about 10mm so the over body length must be around 15mm. Curious white mark towards the back. No streams near, but there is a small pond. Ideas?