Can anyone identify this insect found in the North East of the United Kingdom, July 2019. About 3-4cm long.
Could this be a wood wasp?
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It is definitely a Siricidae and looks like a Urocerus gigas (sometimes called Greater horntail), which is also found in the UK.
In the Nordic countries this is one of the more common species of sawflies, and I suspect the same is true for the UK. The picture below and some info on their biology can be found at species.nbnatlas.org: