Glad Rag
Some sketch details of a time line here albeit not 'official' and no details of 'operational' forecast date.
First U.K. pilots begin training to fly F-35 - Community - Crestview News Bulletin
The U.K. has purchased three of the planes, two of which already are at Eglin. The third is expected in February.
For now, those planes are added to the Marine fleet of 11 F-35Bs. The three planes are expected to be flown to the U.K. by 2018.