YOU CAN TELL A GOOD DEAL ABOUT AN ARTIST FROM his studio. After I arrive at Mark Wallinger's, in the buzzing heart of London's Soho district, he pops out to buy a couple of cappuccinos before we settle down to do the interview, giving me a chance to nose around. His bookshelves contain an erudite mix, with the poems of John Ashbery wedged between James Joyce's Ulyssesand Jonathan...
