Keyboard etiquette: Is it annoying to type loudly?

The Today programme often receives letters of complaint from listeners who are frustrated at the noise of presenters typing on their computer keyboard during interviews.

How distracting or annoying is it for the listener? Is it rude to the guest, or are such noises to be expected given the live news environment?

Magazine editor Tom Hodgkinson and radio critic Kate Chisholm discuss keyboard etiquette.