Thanks for the update. If he has flown, this is a good sign that he knows when and how to search for other food and habitat resources.
He may come back because he knows he has a free food resource from you in the event he can't find another area. Try to call Wendy at Swan Support in Datchet as she may have a contact for you in your area should you need assistance. Yhanks again for the update. The Regal Swan « Hide