Though wasp-like in appearance, it is harmless to humans.  The abdomen is striped in females; more uniformly orange in males. 

Strongylogaster xanthocera. 

See https://www.sawflies.org.uk/strongylogaster-multifasciata/ for differences.

This species has a red ID rating and unless identified by a known expert you must provide a satisfactory explanation of how it was identified for the record to be accepted.

Anywhere that Bracken is present.

This sawfly breeds on ferns and Bracken

Widespread in Britain in suitable habitats, though under recorded.

Local in Leicestershire and Rutland.

https://www.sawflies.org.uk/strongylogaster-multifasciata/