Aircraft part identification.

Can anyone identify this piece of alluminium, fished out of the sea off North Pier, Blackpool. To me it’s obviously an aircraft part, possibly a rib from a control surface or trim tab. It’s 22SWG, 5 inches long by 2 deep. Although deformed, the rivet holes do not appear to be pulled.There is no part number on it as I can see. The finder thought it could be off the Tornado that went in but I think not, it looks more like a light aircraft part. Has anyone any ideas, (or knows a man who may have).