Andrew Cooper, spokesman for CLIC charity says half of all children, who are off school while receiving treatment don't get enough support and contact from their teachers.
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Charles Howeson has been sentenced to seven years and six months for historic sexual offences against eight young men between 1985 - 1994.
The heatwave will culminate next Wednesday, which forecasters say could be the hottest day of 2018.
The Prince of Wales and Duchess of Cornwall visited the city in an attempt to encourage tourists to visit.