Tis is an extract from:-
http://www.gov.uk/government/publica...residence-card

If you are a non-EEA national who holds a valid genuine residence card, issued to you as the family member of an EEA national who is exercising free movement rights in another EEA State (i.e. not your EEA relative’s Member State of nationality) under Article 10 of Directive 2004/38/EC (the ‘Free Movement Directive’), you may use this document for travel to the UK if you are accompanying your EEA national relative here, or joining your EEA national relative in the UK.

Has anybody used this provision ?