The Fleche Velocio is the French Arrow and there are equivalents homologated by ACP in many countries. For the UK, it is the Easter Arrow to York.
The Summer Arrow is not homologated by ACP, only AUK, and only qualifies for AUK awards.
The second bit is a sop for Easter Arrow teams that finish with fewer than 3 riders. The rides will be homologated by AUK but not by ACP.