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I have not read this but

Reference

Smith, M. (2000) The hornet robber fly Asilus crabroniformis: land use and livestock grazing regimes at sites in England. English Nature Research Report No. 387.


http://www.essexfieldclub.org.uk/hornet_robber_fly.htm

I see these flies on Frampton's Field (Shoreham) every year.

It has been grazed by horses for 20+ years only.

Location page:
http://www.glaucus.org.uk/Pixieland2006.html

Cheers

Andy Horton
glaucus@hotmail.com
Adur Valley (West Sussex VC13) Nature Notes
http://www.glaucus.org.uk/Adur2006.html
Adur Valley Nature Notes: August 2006
http://www.glaucus.org.uk/August2006.html
Adur Valley & Downs Gallery
http://www.flickr.com/groups/adur/pool/