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 body found in the Thames this week has been formally identified as that of Marc Hutton, who went missing from Putney on 28th February.
His body was found in the river near Lots Road in Chelsea on Tuesday.
The Metropolitan Police are treating his death as unexplained. An inquest date is yet to be confirmed.
– Toni Scarr, volunteer lifeboat crew member for Tower RNLI
"This incident has been recorded as a life saved as there were no other boats in the area at the time and I don’t think anyone was actually aware he was in the water.
He was incredibly fortunate in that respect.
We still don’t know how he came to be in the water but due to an unusual twist of fate we managed to avoid one more fatality on the River Thames last night.
That first person who was threatening to jump from London Bridge probably has no idea that, all things considered, he saved another man’s life."
A man threatening to throw himself into the Thames inadvertently saved the life of a stranger who was drowning in the river below.
Tower RNLI crew say they would never have spotted a person in the water if it wasn't for the callout to reports of someone on a ledge and ready to jump at London Bridge late on Wednesday evening.
By the time they arrived police had managed to talk the man down, but the crew spotted someone else on the bridge pointing towards the water.
It was then that they spotted the person in the river, desperately struggling to keep his head above the water as he was dragged down by a large duffel coat.
When they pulled him out, the crew found he was suffering from hypothermia and he was taken to hospital.
The RNLI say they don't know how the person ended up in the water, but he was said to have been alert and apologetic when he was attended to by crews.
The London Boat Race is now only weeks away and crews are to be officially unveiled later this morning.
Weigh ins will also take place in front of the waiting media in Central London.
The dark brown area shows the surface water runoff from the recent floods. It happens when the soil is so saturated excess water from rain flows over the land.
A sinkhole has appeared in a street in south London. The Sutton Guardian reports the hole is around three feet deep and swallowed the wheel of a car in Maldon Road in Wallington.
Sinkhole opens up in Wallington as a car drives over it - here's the hole http://t.co/Z1HRXJB2JV
Sinkholes are caused when the underlying rock is washed away - more exactly by the acid picked up by rain water as it passes through rotting vegetation.
That creates cavities underground which streams can flow through - the more water that flows the quicker the erosion.
Read more: Martin Stew explains what causes sinkholes.