The secluded 3.72-acre island, where it is believed the great charter was sealed by King John, is going under the hammer for almost £4m.
Quick-thinking members of the public managed to rescue the cat, who has now been named Arial, after the "distressing" incident in the water.
RNLI rescue crews pulled a man from the River Thames on Wednesday evening after he was spotted clinging to a rubbish barge.
A memorial service will be held today to mark the 25th anniversary of the Marchioness riverboat tragedy. 51 people were killed when the boat packed with partygoers when it collided with the dredger Bowbelle and sank in 1989. The names of the dead will be read out at the service at Southwark Cathedral. Two launches will also be provided to allow families to drop flowers at the spot on the river where the accident happened.
Seven local authorities who were hit by February's flooding have joined together to ask for £265 million river defences from the Government.
Surrey, Richmond, Kingston, Windsor and Maidenhead, Elmbridge, Spelthorne and Runnymede councils have agreed to create a business case for the River Thames Scheme, to protect riverside homes and businesses by building a flood channel and improving three weirs.
The rivalry between Cambridge University and Oxford University continues with the annual boat race on the River Thames this afternoon. Cambridge is desperate to deny Oxford its fifth Boat Race victory in seven years.
Since the races began back in 1829, Cambridge has won 81 times, while Oxford's victory tally stands at 77 races.
Deputy Mayor of London for transport Isabel Dedring said:
The Mayor (Boris Johnson) has long championed greater use of the river for both passenger and freight travel.
With record numbers of passengers now travelling on the River Thames, it is fantastic that freight on the river is also... contributing to a reduction in congestion on our roads.
James Trimmer, from the Port of London Authority, said:
Last year the Thames carried over 265,000 lorry loads of materials. That's a quarter of a million lorry journeys saved. It's good for the environment and communities, with less pollution and noise.
The amount of freight moved through London on the River Thames has trebled over the last four years.
The Port of London Authority says that 5.3 million tonnes was moved in 2013 - a 62% rise on the 2012 figure.
The majority of the increase was down to an extra 1.8 million tonnes of spoil being transported from construction projects, particularly the cross-London Crossrail scheme.