More than 400 personal possessions belonging to the late Prime Minister Margaret Thatcher are up for auction tomorrow in a sale that is expected to raise at least £500,000.

Baroness Thatcher’s daughter, Carol, has put the mementos up for sale at Christie’s auction house in London.

The sale is not without controversy, however, with Lady Thatcher’s son, Sir Mark, strongly objecting. One source close to the family told the Mail on Sunday: “For once, Mark is on the side of the angels. His only concern is to protect his mother’s legacy and he thinks this sale is simply abhorrent. They were extraordinarily close and he would never sell anything of hers.”

It is reported that Carol and Sir Mark, who are twins, “cannot bear to be in the same room” thanks to the sale.

The handbag used by Mrs Thatcher on her last day in 10 Downing Street. (Rachel Megawhat/Breitbart London)

Her famous red dispatch box (Rachel Megawhat/Breitbart London)

Autograph note from Ronald Reagan saying “Happy birthday”, signed ‘Ron’ (Rachel Megawhat/Breitbart London)

The camel-coloured cashmere coat she wore during an official visit to the Soviet Union in 1987. (Rachel Megawhat/Breitbart London)

Typed letter from Ronald Reagan congratulating her on 11 years in power. (Rachel Megawhat/Breitbart London)

The gown the Iron Lady wore at her wedding to Denis Thatcher in 1951. (Rachel Megawhat/Breitbart London)

A collection of the Iron Lady’s dresses. (Rachel Megawhat/Breitbart London)

Baroness Thatcher’s ermine peer’s robe. (Rachel Megawhat/Breitbart London)