I recently had a new electricity meter replaced (at the request of nPower, our supplier) on the 10th April 2014. On the meter plus card the guy left it states: R (meter number) 39998 F (meter number) 04775 on the 9th July i submitted my reading online: 5247 On contacting nPower to find out my balance, she manually worked out the approx bill (39952 on 27th nov 2013) and based on the start reading on the card (04775 to 5247) This gives us an overall CREDIT of £700.00. She said it could be a few pounds either side, as it wouldn't be exact. On contacting them today, they have based on the bill on a start reading (on the new meter) of '0'. Is this right? Does the meter plus card hold any weight in respect of the readings? Is the reading on the card (marked F) the start reading of the new meter? nPower have passed it onto their 'back-office' which could take upto 28 days to resolve. but I was assured the manual reading was accurate (and certainly not out by £700) Please help with whatever advice you can please. Thanks James