its run by the council and its by gp refferal the scheme here is living well derbyshire and the gp can refer you. there are several elements, weight loss a 12 week class learning about diet and calouries etc bit like weight watchers. and the exercise course again 12 weeks of either gym or swimming or in my case chair based exercise. i cant swim so that was ruled out and because of covid restrictions gym space is limited.
might be worth a google for your area. some areas allow self referal.
after the 12 weeks its £4 per class or join the gym at £27 per month.
depending on how it goes i may join the gym as i ought to learn to swim at my age and water exercise is supposed to be easier on the joints etc.