www.google.com/jobs/applicatio ...

There are Four Categories of personality and skills questions: Sales, HR, Engineering, and Staffing

It is a possibility that how an applicant scores on this preliminary questionnaire can make or break their chances to be interviewed – but understandably,when a company gets thousands of resumes, it has to prefilter a sample that statistically have a less chance of being suitable even accounting for errors with this method

Sadly I can't complete it, quite a few American-specific questions.

The survey on .co.uk is exactly the same aswell. While on Google's jobsite, I noticed a listing for the London office to do with telephony integration that includes:
" Design, develop and perform analysis of technical systems and programmatic interfaces relating to telephony technologies, with a particular emphasis on VOIP-based systems." ... "convergence of voice and data technologies as well as systems integration."

Sounds like a UK version of GrandCentral to me.