Just to let you both know, this is what Your Europe Advice emailed me:
Thank you for contacting Your Europe Advice.
We understand that your husband currently holds a residence card for family members of EU citizens following an EEA2 application.
We further understand this was granted to your husband in early 2012 (and therefore before 16 October 2012).
Since then, you have acquired British citizenship. As a result, the UK authorities would no longer consider you as being an EU citizen exercising free movement rights, in accordance with the amendment made to Immigration (European Economic Area) Regulations 2006 by the Immigration (European Economic Area) (Amendment) Regulations 2012 (No. 1547).
However, you should know that family members who were granted (or applied for) a family residence card before October 2012 come under transitional arrangements for family members of dual British/EEA nationals. The transitional arrangements preserve the old rules (where dual nationality of the sponsor did not matter) to remain applicable to family members of dual nationals, so that these family members who hold a residence card can apply for permanent residence under the old rules after October 2012.
While the UK authorities will no longer consider you as an EEA national, this should not affect your spouse s status as the spouse of an EU citizen who holds a residence card issued under the Immigration (EEA) Regula prior to 16 October 2012. Your husband should therefore be allowed to apply for a permanent residence card by virtue of Schedule 3, paragraph 2 of the Immigration (European Economic Area) Regulations 2006.
Your husband should therefore have the right to apply for a permanent residence card using Form EEA(PR) once he has resided for a continuous period of five years in the UK, which we understand will be during the course of 2017.
Further details on applying on applying can be found here:
https://www.gov.uk/apply-for-a-uk-resid ... dence-card
We hope this answers your query.
We remain at your disposal, should you require further information.