When I travel, I always take my Winsor & Newton watercolor kit, which is the size of a pack of cigarettes when folded up. I bought my first one in the 1980s. It was handy to bring on trips, and I packed it into a leather pouch along with a couple of brushes, a pencil, an eraser and paper.

You will see - in the future, I will live by my watercolors.

I like to work in watercolor, with as little under-drawing as I can get away with. I like the unpredictability of a medium which is affected as much by humidity, gravity, the way that heavier particles in the wash settle into the undulations of the paper surface, as by whatever I wish to do with it. In other mediums you have more control, you are responsible for every mark on the page - but with watercolor you are in a dialogue with the paint, it responds to you and you respond to it in turn. Printmaking is also like this, it has an unpredictable element. This encourages an intuitive response, a spontaneity which allows magic to happen on the page. When I begin an illustration, I usually work up from small sketches - which indicate in a simple way something of the atmosphere or dynamics of an illustration; then I do drawings on a larger scale supported by studies from models - usually friends - if figures play a large part in the picture. When I've reached a stage where the drawing looks good enough I'll transfer it to watercolor paper, but I like to leave as much unresolved as possible before starting to put on washes. This allows for an interaction with the medium itself, a dialogue between me and the paint. Otherwise it is too much like painting by number, or a one-sided conversation.