The painting is at the National Gallery until 14 December. Artist Bridget Riley, 77, was today to become the latest to pay homage to the Titian, after Lucian Freud, Peter Blake, Paula Rego, Tracey Emin and Michael Craig-Martin joined in support. Jenny Abramsky, who recently took over as chairwoman of the heritage fund, said: "It was an extraordinary decision for us financially, but it's as important as ever to protect our cultural heritage."