Haunt Of The Tachinid Fly

In the riverside gardens next to the town square in Harborough I just happened to see this tachinid fly moving around at the edge of a flower border. It is apparently a little shy about coming out into the open. I wouldn't have known what it was if I hadn't videoed one of them attacking a butterfly - that video is available on YouTube - please search for 'tachinid'. There is also a video of the painted lady buttefly that was attacked by that fly, recorded a few seconds earlier. Chris R., joint coordinator of the UK Tachinid Recording scheme - http://tachinidae.org.uk/, emailed to say that what I thought was a tachinid fly may have been a closely related species. That may apply to this fly also. Some tachinids and related species parasitise worms and it might be that they could help to control the New Zealand triangular worm that is killing off earthworms in the UK and causing drainage problems in some places because of how earthworms help to maintain soil porosity.