I'm going to say that it depends on who you think the users are. It depends upon the sector whether advertising is the best way of reaching them. It could be that the most effective way to increase the awareness of the data is to send it to whatever the representative body of the charities and civil society is, in a letter from a minister or a senior official, asking them to spread the word to their members, and the same would be the case with the energy representative body—rather than paying for advertising.
But in principle, I favour drawing people's attention to it, absolutely.