I have had a discusion with Wren, and you are correct, the Simjet 1200 is a Wren 54 built under licence with a few 'tweaks' but it is not the Supersport.
The Supersport is not released yet, and will not be made under licence by anyone else, it is far more powerful than the 1200, or the standard 54.

Just to put things straight.

Regards and a happy new year to you all.