See that this idiot government has pontificated about the explanation mark!
Children as young as 7 will be marked down for using out of context.
So the latest idiot rules are that it should only be used with complete/proper sentences in which there is a verb and begins with "what" or "who".
The dead hand of Gove seems present!
Takes no account of modern use and context.
What is a reasonable minimum spend for an online grocery delivery??
Another silly little ABC game - shops we have loved and lost?