Branches and leaves off the stem.
No interactions present.
If you entered the ID without 'sp.', you would find there were lots of other pics of Hieracium for comparison and for consideration of the discussion connected with them, which might be useful.
My Flickr photos...
I don't think that it's narrow leaved hawkweed (Hieracium umbellatum), which is the only "easily identified" species.
My understanding is the common hawkweed (I assume that you mean Hieracium vulgatum) is rosulate, that is has a basal rosette of leaves when flowering. If I'm reading the photographs right this one is arosulate.
There are about 250 species of hawkweed in Britain.
It was arosulate.
At least I can tell it's a Hawkweed now. Given what you've said that may be as far as I'll get with the ID of this.
Lat/Lng: 53.6995, -1.9223
OS grid ref: SE052225
On a bank by side of footpath.