However, the report questions JN's popular support within Syria and says it is isolated internationally, our correspondent adds.
BBC: Syria conflict: New insight into shadowy jihadist group
Up to 500 jobs may be created by JN Bentley at the former Wrekin Construction site in Shropshire.
BBC: UK jobs tracker
"The short-term strategy of JN is primarily military focused, although preparations are being made for long-term sustainability of the group, " it says.
The 13-page document describes Jabhat al-Nusra (JN) as one of Syria's most effective groups, which aims to establish an Islamist state in the country.
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