The dontpayUK would technically work from a business (energy supplier) point of view. Products are only worth what consumers are willing to pay for them. Look at the Petrol and Diesel prices, In multiple towns across the country the community worked together and each week choose one local garage to stop buying from, what happened.. The costs start to fall. No business will charge less for a product which sells for more. You dont drop prices whilst people are willing to pay that price.
So DontpayUK would cause a huge effect to the energy companies - the amount of admin it would cause alone would be bad.
BUT
From the consumer point of view (us muppets who roll over and say "I'll pay it, it'll get easier"), dontpayUK WILL damage your credit score.. You WILL have to pay the bill at some point in your life, there is no escaping that. So you should really ask for you personally is it worth it? Dont pay, eventually it'll go a debt collector who (for example) accepts a payment of £50 a week, well that' better than the £85 we are looking paying (Small household predicted cost). However, you will then be paying the debt off whilst still paying for energy. So in the mean time right now, you have more money.. later on that will bite you.
So lets look at you dont pay, but have good will power and put the money you with hold to one side. Now this COULD work and you COULD avoid the bad credit rating too. You can miss 3 payments before something registers a default. So you could with hold the money for 3 months and hope the energy companies sweat enough in the those 3 months to drop prices. However this would only really happen if the other half of the UK are just not paying and waiting for a debt letter later on in life..
One thing you really need to think about is your future and your credit,
You want a mortgage - credit check,
you need to rent somewhere new - credit check,
your car failed its MOT massively and you cant afford a new one... Finance (Lets face it 99.9% of car finance companies now give anyone (even those on low end benefits) £9,999 with no deposit finance for a car, even with bad credit) But due to your credit score you are now paying 35% interest.
Your washing machine breaks, havent got £400 to buy a new one? You'd finance it - Credit check
Mobile phone contract - Credit check
Sky, Virgin etc - Credit check
Insurance (Pet, Home, Car) - Credit check.
My point regarding all the above is, don't join a bandwagon, Look at it from all angles (Business, Consumer, Society etc - fully understand the full circle of events) and do what is right for you! Stand for what you believe in, be loyal to yourself, but please don't do things just because the people who live 5 doors down are, do things because you feel its right for you. Only you can weigh up the pro's and con's for your household.
I am not fore or against the DontPayUk. I support anyone who does things that feel are best for themselves.
I hope this helps people