I remember thinking that people's worlds must all be slightly different from each other, depending on who they were and where they were. I remember thinking that each person had their own separate world, and it almost made me dizzy.

Bowker, who taught children with learning disabilities for 14 years, captures the frustrations of Joe and his family beautifully. What the drama lacks, though, so far is humour and irreverence. Yes, Christopher Eccleston’s Granddad’s inappropriate comments are funny but Joe himself, played with perfect opaqueness by Max Vento, never even makes you smile. Most parents find their autistic kids really funny – sometimes because they mean to be, and sometimes because their lack of social niceties is hilarious.