There are a total of 8.8 million tickets available for the Olympics and 2.2 million for the Paralympics, prices starting at £20. While 20% - 25% may be reserved the games are likely accessible to the average UK resident.
To get back on topic I agree with piatkow...
G have the technology
Google has flexed their muscle in almost every other way when it comes to what is available / not available in their SERP's, it seems contradictory to find that "unofficial resellers" can't be filtered out. Not to mention the obvious - convenient.