The French Consulate General also delivers visas allowing the holders to travel to the DOM/TOM: Guadeloupe, Martinique, Reunion Island, Guyana, New Caledonia, French Polynesia, French Southern Territories, St. Pierre and Miquelon or Mayotte. The visa obtained IS NOT a Schengen visa and is subject to a different procedure to obtain.
For further information, please write to: "Consulat général de France, Service des visas, 6A Cromwell Place, P.O. Box 57, London, SW7 2EW", enclosing photocopy of the main pages of your passport and indicating your exact destination, as well as the length and purpose of your stay. Please provide a self-addressed stamped envelope for the reply.
Note that the legislation has recently changed: you are therefore advised to enquire on the required documents/ delays involved even if you had previously been issued with a DOM/ TOM visa.