Laurence Llewelyn-Bowen introduces coverage of the Royal Academy of Arts Summer Exhibition, the biggest open art exhibition in the world. Lifetime doodler Maureen Lipman picks up her paintbrush and enters the show for the first time. What will the judges make of her work? Art collector Alvin Hall delves behind the scenes on Buyers Day and offers guidance on snapping up prints. And an expert panel, David Mach, Sacha Craddock and Miranda Sawyer, pick the must-see works of the show.