Michael Adebolajo and Michael Adebowale are due to go on trial on November 18 over the murder of Fusilier Lee Rigby in Woolwich.
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Duncan Jones tweeted: "1 month since dad died today. Made this card for him at Christmas. Due in June. Circle of life. Love you, granddad."
More than 10 days after his body was found, Richard Cole's family claim they are still in the dark over the circumstances of his death.
A cold and frosty start, then staying largely dry with plenty of sunshine.