The remainder is being crowdfunded through the Art Fund website, with many artists offering rewards in exchange for donations.
Art Fund spokeswoman Rachel Mapplebeck said: “Derek Jarman’s Prospect Cottage is really a work of art in its entirety.
When the Oscar-winning British costume designer Sandy Powell found herself with a Bafta nomination for The Irishman, she thought: “What on earth am I going to wear?”
The artist Tacida Dean and actor Tilda Swinton approached the Art Fund to come to the rescue.