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@Andrea1970 Sorry for the late reply your DD will stay the same unless you have clear evidence that your consumption will be lower in the entire 12 months to July 2023.
@Najiba Sorry but this forum is not live chat, ring customer services 0800 027 0072.
@Byrne11 The internet says about error code 35:
This isn’t anything to worry about, this can sometimes be dust or something else obstructing the meter from registering the chip. Take out your key or card from the meter, and wipe the chip. Put your key or card back into the meter and try again.