There are a lot of visual marks that have to be hit, and lines that need to be said in a right way - so there wasn't really any improvisation on the set when it came to the bulk of the script.

I never know what it's going to look like. Wouldn't be much point in painting if I already knew the outcome. I have a subject in front of me and I start flooding colour and making marks, I don't know, it's improvisation isn't it?