I personnally would suggest that rather than jumping to conclusions about who was and wasnt a competitor you allow time for the CAA to analyse radar traces and ensure that ALL aircraft involved had departed FROM and arrived back AT White Waltham.
Point of order - didn't at least one entrant elect not to
return to WW? (no information expressed or implied that
this may, or may not, been one of the 12 that did, or did
not, impinge upon controlled airspace that may, or may not,
exist in the Solent area).
Ed