http://www.rcgroups.com/forums/showthread.php?t=694644
According to this gentleman seems as if the power output of the DX7 is in dispute and is too high for safe EC/UK operation.
I find this interesting since David Gladwin just did a review in RC Jets International and said in the article it was approved by UK BMFA.
I also found it interesting in this blog and links within that Graupner has their own 2.4G module for JR and has the antenna as part of the module,
Perhaps this JR module will work with the new upcoming JR proprietary 2.4G 9303 systems???