Sir Cliff Richard has withdrawn from a charity event at Canterbury Cathedral on 26 September as he "doesn't want the event to be overshadowed by the false allegation," a spokesman for the singer has said.
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A top temperature of 9 or 10 Celsius (48-50 F).
The poll comes ahead of a debate in the House of Commons on Friday on a new Bill which would introduce such a system in England.
Jobs with decent pay and flexibility are "few and far between" for single parents who are the main earner and carer, said the report.