No interactions present.
These are two different flies. The first looks like a Tachinid, but the second is a Muscid, probably Graphomya maculata (could be minor).
Would be best to edit and add one as a separate sighting,
My Flickr photos...
The venation of the LH one does not look like Tachinidae. Anthomyiidae is a apossibility as the anal vein seems to be complete.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
As has been said, the second photo is unrelated to the first. The first photo shows a Dexia or Dexiosoma.
Lat/Lng: 50.9373, -3.0459
OS grid ref: ST266158