Possible hornet??

Possible hornet??

Observation - Possible hornet?? - UK and Ireland. Description: This thing clumsily flew about my garden and was getting too close to my kids for my liking so I hit it down and killed it and I'm pretty glad I did upon seeing the size on the sting. It measures 15mm long by nearly 1mm thick. It was like a damn sewing ma

This thing clumsily flew about my garden and was getting too close to my kids for my liking so I hit it down and killed it and I'm pretty glad I did upon seeing the size on the sting. It measures 15mm long by nearly 1mm thick. It was like a damn sewing machine needle.
It's as it appears apart from the head that came off but looked very wasp-like with yellow feelers.
The whole thing would have been around another 10mm long if what fell off hadn't!