Very much worth seeing - True to Life: British Realist Painting in the 1920s & 1930s, on at The Scottish National Gallery of Modern Art until 29th. October. Follow the link and scroll down for some of the highlights including James Walker Tucker's Hiking, c.1936 (see postcard above), and James McIntosh Patrick's A City Garden 1940.
On a side note, if you should visit the exhibition and go to the gallery café for refreshments, try the unlikely-sounding but quite delicious spinach and hazelnut cake - this one looks similar.