2+2=29472958385
I'm worried Tesco is going to run out of tinfoil.
Firstly let me say that this is a topic close to my professional occupation, so I have a fair idea what would be involved.
This announcement relates to the use of whole-genome sequence data (as opposed to single gene data, already in widespread use) in supporting clinical decisions about which treatment a patient should receive. This pretty much eliminates any insurance concerns, since we are talking about patients who have already been diagnosed with a disease having a genetic component - like cancer. Even if it weren't, there is a moratorium on the use of genetic information in insurance, in place since 2001 and continually renewed - currently lasting upto 2017.
The current methods of determining treatment are in many ways archaic, and this is simply the next and frankly necessary step in improving patient care. It is true that a person's genome is very sensitive data, but we already have these issues relating to research subject data, for which there is an existing and well thought out data storage strategy (I won't go into details). Applying the technology to clinical care in the NHS is effectively a scale-up problem (from the data side of things at least - there are actually huge clinical challenges still).
I think it's fairly safe to assume that there is unlikely to be "a database" - that's why "data infrastructure" is used. The raw data for a complete human genome is reasonably large (~200GB), with much additional data required. It is not necessary to keep all this in order to be useful clinically; rather, a derived summary of the differences between your genome and a reference genome is more likely to be the source material for a clinical decision. But to get there, you need an infrastructure - where is the sequencing performed - at a private facility? What about the analysis, in a regional or national centre? And the clinical decision - back in the hospital? It is even by no means a given that the data will even be kept at all for any length of time. It could be destroyed after a course of treatment, for example.
Put simply, a secure infrastructure for storing and analysing the data still needs to be built, this would be a closed system and is a far cry from your doctor having your genome on a USB stick. There is simply no need for the data to ever leave the walled garden, and no real need in particular for it to be "a database" in the sense of it all being in the same place.