“Nothing in this Part of this Act shall-…(d) authorise the disposal of land by a local authority, whether by sale lease or exchange, in breach of any trust, covenant or agreement binding upon the authority;” andsection 10 of the Open Space Act 1906 expressly created a trust”. “Nothing in this Part of this Act shall-…(d) authorise the disposal of land by a local authority, whether by sale lease or exchange, in breach of any trust, covenant or agreement binding upon the authority;”