More Government Advertising

The government is running a TV campaign to recruit teachers - all very necessary, but why? I know a lady locally who is a brilliant teacher, but she's changed to being a supply teacher because the conditions she worked under as an employed teacher were intolerable. My father was a teacher and I know things have changed in that profession, and not always for the better. Instead of just advertising for more, perhaps the government should look at why teachers are quitting!