I can explain at a high level. When I think of direct marketing, it encompasses a wide variety of things. You're right. Obviously pieces of mail in your mailbox is one of them, but telephone calls would be another. Email is another example of things.
Probably the way to think about it is that a really good communications campaign uses all the different forms of media that are available to try to get the information to the individual. For every person who is taking a householder and not looking at it, there will be some who do.
Equally, you want to impress your message multiple times. If you just happen to see it once in your mailbox, even if you look at it, you might forget about it. However, if you receive an email or a telephone call about it, you see it on television, hear about it in the media, or whatever the case may be—social media, for example—the more times you hear about something, the more likely it is to connect with you; plus the more likely you are to reach more people.
We might tend to spend a lot of time talking about government advertising, but my view is that a lot of the time this might be driven by the media and the media's interest. I have this general view that the media often treats it like a bit of a horse race. How much money has been spent on advertising in this given time? Also, they're waiting for these quarterly results. It's really not as helpful as a broader consideration of communications as involving an awful lot of things, of which advertising is one element.