Tachina magnicornis

Closely resembling T. fera but with the tarsi much darker and a broader frons (male usually more one one-third the head width, female about two-fifths the head width). More information: https://www.flickr.com/photos/63075200@N07/albums/72177720303603490/

Tachina fera

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.

Spring-Autumn.

T. magnicornis was formerly only known in Britain from the Channel Islands but is now spreading on the UK mainland. 

Uncommon.