Ten Things You Need to Know Today: Tuesday 13 Sep 2016

1. Corbyn and Johnson hit by boundary changes

MPs who could lose their seats if changes proposed by the Boundary Commission, intended to make constituencies fairer, are accepted include Jeremy Corbyn, Boris Johnson and George Osborne. The plan is to make the changes, supposed to ensure seats have the same number of residents but said to favour the Tories, by 2020.

Jeremy Corbyn is a 'disaster', says Stephen Hawking

2. Islamic State 'sleeper cell' arrested in Germany

Three Syrian men, suspected of being members of an Islamic State sleeper cell, have been arrested in Germany. More than 200 police took part in pre-dawn raids in Schleswig-Holstein and arrested the men, aged between 17 and 26. The men, who arrived in Germany last year, are thought to have links to the Paris attackers and were preparing an attack of their own.

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3. Plastic fivers enter circulation today

Bank of England £5 notes made of polymer, rather than the traditional paper, go into circulation across the UK today – some 440 million of them. The new notes are smaller and more durable than their predecessors – and feature a portrait of Sir Winston Churchill. In Scotland, Clydesdale bank already uses polymer for its notes.

New plastic £5 note: Everything you need to know

4. HMS Terror: Polar wreck explored

The Arctic Research Foundation has located and explored the wreck of HMS Terror, a British ship which disappeared searching for the Northwest Passage 168 years ago. A search team used a remote underwater vehicle to enter and explore the ship, part of Sir John Franklin's ill-fated expedition. All three masts are still standing, though broken.

5. Lawrence murder: Strap 'part of weapon'

London's Met Police now says a strap, probably from a handbag, found near the scene of the 1993 racist murder of teenager Stephen Lawrence may have been part of an improvised weapon. Yesterday, the force appealed for the female owner to come forward after a woman's DNA was found on the item. Four men are still being sought.

6. Five more golds for GB in Rio

ParalympicsGB won another five gold medals in Rio yesterday. Popular swimmer Ellie Simmonds broke the world record in her SM6 200m medley race, as did Sascha Kindred. Susie Rodgers won gold setting a personal best in the S7 50m butterfly. Britain now has 63 medals in total, 28 of them golds, and is in second place to China.

Gold for Storey as ParalympicsGB surpass London 2012 haul

7. Anger as BBC loses Bake-Off rights

Fans of the Great British Bake-Off, the BBC's wildly successful TV baking talent contest, are outraged after it emerged the corporation has lost the rights to screen the show. Programme maker Love Productions said it signed a deal with Channel 4 after the BBC offered too little. Fans insist that Channel 4 must not change the format.

8. England swelters in record temperatures

The highest September temperature since 1911 has been recorded in Gravesend, Kent, where the mercury reached 34.4C on what is the hottest day of 2016. The Met Office has issued a heatwave alert for much of the country with the warm weather expected to last for several more days. However, rain warnings are in place for some parts of northern England and southern Scotland.

9. Author Roald Dahl's centenary celebrated

The world-famous children's author Roald Dahl would have been 100 years old today – and celebrations are taking place around the country. Dahl has sold more than 250 million books worldwide and his writing has inspired countless films and plays. His daughter, Lucy, said she believed Dahl's tough childhood had influenced his work.

Roald Dahl quiz: how well do you know his books?

10. Briefing: What is next for David and Samantha?

After offering his resignation Cameron said he has no "current plans for his future", although there have been a few hints about what he and his wife Samantha might get up to next. The Daily Mail claims Cameron will follow in the footsteps of Tony Blair by penning his own autobiography. His wife, meanwhile, is rumoured to be working on a new clothing label.

What is David Cameron doing now?