It was no accident that I found my way to Götz at the time [c. 1960-62]. This 'Informal' element runs through every picture I've painted, whether it's a landscape, or a family painted from a photograph, or the Colour Charts or a Grey picture. And so now it is a pursuit of the same objectives by other means... As I now see it, all my paintings are 'Informal'.... except for the landscapes, perhaps... The 'Informal' is the opposite of the constructional quality of classicism – the age of kings, of clearly formed hierarchies.

p. 42, note 45 : quote on his period of Informal art - 'Doubt and belief in painting' (2003)