By Mr (Sydney) Ivon Hitchens (1893 - 1979) 'Geranium & Lilies', or 'Lilies and a Geranium on a Hampstead Window Sill' (c1936), Oil paints on canvas, 56 cm by 91 cm.
(Image credit), Thanks to Tamsin of the Modern British & Irish Art department (on behalf of Sotheby's) for a digital copy of this beautiful painting.