Speaking as someone who works for the Carbon Account's original developers, from what I can gather I don't think the functionality to support fitting a new meter was ever built! It just never came up during our testing (although we did test for meter wraparound: when your meter goes to 99999 and back to zero.) I'll check again with someone who might know for sure.
There's no funding for ongoing development at all, so if it's not currently possible then I can't honestly suggest that it's likely to get built any time in the near future. In the mean time, as we've had our own meter changed recently, I can offer the following rather mediocre solution:
- On your current house:
- Put in the last cubic-feet reading for the old house
- Put in an electricity reading for the old house too (it can be backdated to the same point as your gas reading for the purposes of the long-term data record)
- Click "I no longer live here" on this house
- Create a new house (!) with the same characteristics (number of bedrooms) as your old one
- Put in the zeroed cubic-meter reading in
- Put the same electricity reading in as above
- Enter all your future readings on this house
It's not ideal but it's better than converting on the fly. If anyone's any suggestions for another carbon recording site then I'd be glad to hear them: I love the Carbon Account but I appreciate that people need ongoing development and improvements to have more trust in a system.
… Shouldn't the government be doing all this by now? 
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