There are just under eight million adults in the UK who only have access to free-to-air television, relying on it as a vital source of entertainment, information and company

These viewers watch much more television, and depend heavily upon the diversity and quality of content delivered by the BBC and other public service broadcasters

Without further support for PSB content in all genres, for all audiences, there is a risk of leaving millions of people out of ever-rarer shared cultural conversations, speeding up feedback loops of viewer decline, and losing the core public value in the ecosystem as a whole

Addressable linear TV advertising, where precision-targeted ads overlay default linear ads, could enhance the TV proposition for advertisers, agencies and viewers, benefiting all broadcasters

In the context of dwindling linear viewing and rocketing online video ad spends, the adoption of Sky AdSmart and similar services on YouView and Freeview could take addressable TV ads from a sideshow to a pillar of revenue

Addressable linear is a bigger and more strategic prize for broadcasters than BVOD ads. Sky holds the key to wider adoption of its AdSmart platform if it can find a way – or a price – to bring ITV Sales and/or 4 Sales on board 

Subject to BBC Trust approval, Canvas looks almost certain to launch in spring 2011 after the OFT decided that it did not have the jurisdiction to review Canvas under the merger provisions of the Enterprise Act 2002. The OFT decision does not rule out complaints on other grounds, but the chances of persuading the regulators look very small

The launch of Canvas promises to strengthen significantly the free-to-air digital terrestrial platform, otherwise very limited compared with satellite and cable platforms in terms of bandwidth, but mass adoption poses numerous challenges and it is open to question whether Canvas will ever extend to more than half the DTT base

In the long term, it is hard not to see Canvas as an interim step in the growing convergence between the TV screen and the internet, raising the question of how successfully its PSB TV-centric approach can adapt to the coming challenges of the full blown digital age