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David Cameron wrote Nelson Mandela "will inspire generations to come" as he signed a book of condolence at South Africa House in London.
The Prime Minister wrote: "Your cause of fighting for freedom and against discrimination, your struggle for justice, your triumph against adversity - these things will inspire generations to come.
"And through all of this, your generosity, compassion and profound sense of forgiveness have given us all lessons to learn and live by."
He ended his message with the quote, "Blessed are the peacemakers for they shall be called the children of God".
St Botolph's Church in Boston, Lincolnshire was affected by last night's flooding:
Prime Minister David Cameron said his abiding memory of Nelson Mandela was "his complete forgiveness, his total lack of malice" towards those who had imprisoned him.
Mr Cameron said the former South African president had "a wonderful sense of humour and a wonderful generous sense":
People who evacuated homes prior to flood are advised, as a precaution, not to return home until after high tide this lunchtime. #floodaware
Northumbria Police said tidal surge levels in its force area were lower than those experienced yesterday, but warned that this evening's high tide could bring more flooding:
– Northumbria Police statement
People are reminded that there will be a second high tide this evening and, although not anticipated to cause problems, there is still the potential for flooding.
E.ON has announced its customers' dual fuel energy bills will increase by an average of 3.7% from January 18.
The company said that means the average variable dual fuel bill will go up by £48, electricity only prices will increase by 3.7% or £20, and gas only bills will climb by 4.6% or £37.
Chief executive Tony Cocker said changes announced by the Government earlier this week reduced the overall level of the rise that was necessary to cover extra costs.
The energy firm said it was "working hard to limit the impact on its customers" by announcing a lower average percentage rise than any other major supplier.
The Springboks have uploaded a video "showing what massive impact former President Nelson Mandela had on the world, South Africa and rugby in particular."
In 1995, he presented the Webb Ellis trophy to captain Francois Pienaar after his side won the Rugby World Cup.
"The Mandela statue in Parliament Square is now a garden of remembrance for those wanting to leave floral tributes," mayor of London Boris Johnson tweeted.