It would be unusual to file a flight plan for a short distance trip of this nature, VFR and staying within the UK. If there was a planned IFR leg, or it was going outside of the UK mainland, more likely. But, as Overt says, it doesn't give names (quite often the Captain's name and mobile number is appended, but that's not a legal requirement).
If something was going outside of Great Britain (note the term) then a GAR form is required, and that does list passenger names
G