The singer and her husband Guy Ritchie are said to be "dreading" the imminent visit by Penston Kilembe, who will spend up to five days at the family's ￡6.5million Marylebone house as part of a "home study".

James Albright served as Madonna's bodyguard from January to July 1992, after which he became romantically involved with her and remained so until 1994.

The letters and notes, all of which come on "Madonna" headed notepaper, were sent by the singer at a time when she was professionally at her most controversial. She had just brought out her Sex book and was about to release a sadomasochisminspired album named Erotica.

The handwritten letters are signed either "Spanky", apparently a reference to her bedroom preferences at the time, or "Lola's Mum", which is understood to refer to the ambition that Madonna had back then to name her first child Lola. Others sign off with pink lipstick kiss marks.

A source at Marquee Capital, which is selling the items, claims that rather that being merely salacious, they actually give a fascinating insight into the singer and the workings of her mind at the time.

"It's not all about sex. Some of the notes and letters talk of her world falling apart, others talk of her feeling really low and down. She talks of Albright being the best looking guy in the world and that he does not open up enough to her.