I am asking this question for my neighbour who uses a top up key for her electricity and a top up card for her gas, today I put £40 on each for her, she has credit on her meters at the moment, does she have to top up immediately or can she wait a while until she does so, will the money on the key/card stay there until she does, if so how long for?
Thank you
Best answer by Blastoise186
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