The latest exhibition at London's Mall Galleries opened on Wednesday: Pastel Society. This example is Buses and Taxis by Charing Cross Station by Roger Dellar PS. Collector's note: at least two Pastel Society members are exhibiting oil paintings at the RA Summer Exhibition; their pastel paintings are a fraction of the cost of their oil paintings. Admission prices are also a lot cheaper than the RA: £2.50, concessions £1.50. The exhibition continues until 21 June (closes 3pm final day).