English to Chinese Tech/Engineering IT (Information Technology) social enterprises

These social enterprises operate in perhaps the world’s most supportive environment. Over the past two decades, the UK has created an eco-system with legal models, government procurement policies and financial products to support {their} growth. Think tanks and intermediary organisations have been set up to buttress their development through policy advocacy, research and publicity.

是指 legal models？government procurement policies ？ legal models和government procurement policies ？还是指social enterprises ？