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I know I have a unique bubble of friends and acquaintances and this probably isnt the sentiment across the UK, but 4 people (2 single mums and 2 families with kids) have told me they've cancelled their DD, gone quarterly billing and are just going to get into debt over winter and have no plan/ability to fully pay it off. Just kick the can further down the road for as long as possible.
It reads like you're saying "yes they will turn on the heating, I had to" but they may well not be able to and may well die.