Unfortunately it looks like just another bureaucracy with opportunity to appoint friends and supporters, but no real teeth or legal authority:

"-no remedy or relief is available for failure to meet the 2050 target or an emissions budget, and the 2050 target and emissions budgets are not enforceable in a court of law, except that if the 2050 target or an emissions budget is not met, a court may make a declaration to that effect, together with an award of costs

-a person or body may, but is not require to, take the 2050 target or an emissions budget into account in the exercise or performance of a public function, power, or duty"