Thirty five pounds is a lot of money to some people.
Absolutely agree, and don't pay for the service by all means. But then don't use your neighbour's bin who has paid without asking or offering a contribution! Most people have kept their bins and subscribed where we are, but I know of a couple who are sharing by agreement. If someone was in difficulties, I'm sure the OP would be happy to come to an arrangement if asked. People just need to show a bit of basic manners.
I would not be surprised if Blue and Green bins were next.
Charged by weight
I think you're safe there, unless they change the law. Councils have a statutory duty and legal obligation to remove residential waste including recycling without separate charge (i.e. within council tax). It's only because garden waste is specifically listed as an additional service in the relevant regs that the Council is able to charge for this.