When Mr and Mrs Clever-Nasty-and-Rich met Mr and Mrs Thick-Sweet-and-Poor
Torben Betts, head boy at Alan Ayckbourn’s unofficial school of apprentices, has written at least a dozen plays I’ve never seen. Invincible, my first encounter with the heir apparent, is a sitcom that pitches London snobs against northern slobs. The script is fascinating because it demonstrates, in concentrated form, the limitations of the Ayckbourn method
