Switching from Durable Relationship to Spouse

We submitted an application for a family permit for an American national who is married to a French national, who was exercising treaty rights, in the UK. The French national was settled in the UK, having worked since February 2008. We assisted the couple initially under the category of a Durable Relationship on the basis of their cohabitation.  Once they were married, in a ceremony in New York, we made the application for him to join her in the UK.