The Tate Britain gallery has received a collection of 1,200 pieces from artist Francis Bacon, owned by a friend of the late painter.
As well as paintings there are photographs and documents (Credit: Tate)
Barry Joule, a neighbour and friend of the artist since 1978, has in his collection photographs and documents of the painter, who died in 1992 aged 82.
Tate said it hoped getting the collection would help "scholars to resolve remaining issues about Bacon's working practice".
The items will eventually go on show.
Parts of the collection have already been shown at the Irish Museum of Modern Art in Dublin in 2000 and at the Barbican Centre in London in 2001.
The Tate will study, photograph and archive the collection over the next three years.
The collection will also be put online so it can be studied alongside the Irish painter's collection at his studio in Hugh Lane in Dublin.
The gallery also said it is due to be bequeathed more Bacon material from Mr Joule at a later date.
Bacon's died in 1992 aged 82
The collection is said to show the chaos in which the painter - whose work is widely regarded as some of the most important of the 20th Century - worked in.
The Hugh Lane studio faithfully reproduces the conditions he painted in.
Earlier this month Tate Britain announced it was trying to borrow a Bacon painting that has lain in storage in a Tehran museum for the last 25 years.
Bacon's triptych Two Figures Lying on a Bed with Attendants is seen one of the artist's major works.
"It is such a key painting and it should be shown at the home of British art," a spokeswoman said.