I too have been keen to discover an answer to this elusive and hotly debated question. An official reply from the RN to this exact query posed by myself via the MoD stated that the RAF's green Merlins will indeed be coming across to the FAA.
Will this become reality? Who knows(?). If anyone else is more 'in the know' it would be interesting to get some information. The other thread on this topic, of course, descended into an inter-service slagging match and did not answer anything definitively.
(P.S. This is my first post having observed the pprune battles for some time without ever chipping in; I am not press etc......)