He said: 'We were a bit worried because Heidi could read and write at two, which was very early.
'There are some things she finds challenging because she does not like to get things wrong. But if she can finish work quickly it means she can run off and play. She is not trying to grow up too fast at all.'
Heidi's brother Isaac, aged 11, is also accomplished - he is a chorister at Winchester Cathedral.
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