Auction watchers are predicting a record price for a JWM Turner when it comes up for sale this week. “The Blue Rigi: Lake of Lucerne, Sunrise, is predicted to fetch more than £2m when it goes under the hammer at Christie’s auction house on 5 June. The current record for a Turner watercolour on paper is £2.04m, set in 2001 by Heidelberg with a Rainbow.”