Firstly, I forgot to save the file as .php, rather than .html
Secondly, I tried to execute the file from a project folder, IE (7) seemd to think it was a download! Eventually I realised that the file has to be in the same folder as phpinfo (or presumably a child folder will do). I placed the file there. Bingo! Success! Now I can start blundering around MYSQL and design the odd (cery) form.