The international jury choosing an architect to design a new National Gallery, which will also provide a new home for the Ludwig Museum in the Hungarian capital, has invited seven leading practices to take part in a new competition after a first competition did not produce a winning design. The seven architects invited to compete for the high-profile commission are: Jean Nouvel, David Chipperfield, Mecanoo, Nieto Sobejano, Renzo Piano, Sanaa and Snøhetta. Launched last week, the competition’s winner is due to be announced next April.