Parents have shown concern about the commercialisation and sexualisation of children.
Nine in 10 parents are concerned about sexually explicit outdoor advertising and inappropriate products for children, such as padded bras.
The poll was carried out by the Chartered Institute of Marketing.
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A top temperature of 11 Celsius (52 F).
The event, which was held at the Dorchester Hotel last Thursday, was attended by representatives of some of Britain’s biggest companies.
Reports in the Daily Mail and the Telegraph said published guidance has been changed for 2018 to only fly the Union flag on Remembrance Day.