A Letter in Mind is a special exhibition that will be open from 24-28 October at Gallery Different (14 Percy St, London W1T 1DR). Some of the amazing artists taking part include; Sir Grayson Perry, Axel Scheffler, Christopher Nolan, Joe Lycett, Leigh Francis (Keith Lemon), Mark Gatiss, Morag and Ishbel Myerscough, Harry Pye, Nicky Bryant, Robert Raynard, Louis Caulfield, Annabel Dover, Russell Herron, Phylida Law, Andrew Marr, Kevin Eldon, Simon Munnery, Gill Rocca, Sarah Wood, Eva Tait, Chantal Joffe, Indira Varma and Dame Zandra Rhodes. All artworks will be priced at £85 and sold via their online gallery. The works will remain anonymous until they are sold; the names of the artists will be revealed at the end of the exhibition. All proceeds from sales will help to transform life for the millions of people affected by neurological and neuromuscular conditions in the UK. The online gallery will be found at so grab a piece of envelope art and make a difference. Online sales begin at 11am on 25 October. Since their launch in 1984, The National Brain Appeal has raised more than £56m.