© Shihao Mei/UnsplashFirst heard 10pm, last heard 3am on night of 10th/11th April 2019. Repetitive trumpet/metal grinding sound that was at times very loud. We live in Shirehampton, near Bristol Port so this could conceivably be big ships moored in the harbour making groaning noises, but otherwise I am not sure what to think! The roaring background noise is the M5 motorway which is somewhat dampening the strange sound. Another recording taken on 10/04/19:On April 10, 2019, YouTuber user 'Peter The Pleater' recorded two strange sound events he heard at his home in Shirehampton, Bristol, UK: