The 15 hour conversion option for the holder of an ICAO IR relates to the issue of a JAA rating; the UK may not issue any JAA licence or rating after 8 April 2011. The derogations allow existing JAA/national qualifications to be used in EASA aircraft for the periods stated. To have an IR issued after 8 April 2011, it will be necessary to comply with the the requirements of Part-FCL.
In that case, how come UK FTOs, and other FTOs around Europe, are doing the 15hr conversion right now as I speak?
Did you mean 8 April
2012?