To reassure my colleague, I do share the concern that we don't want to lose information. Having worked on databases covering 10 years of data, the behaviour, the pattern you want to look at is pretty much covered in this period of time. Where we feared losing some information at the beginning of the period, more than 10 years, we have the challenge of stretching that to the trial and justice system and what you can prove is quite limited because of time to give all the evidence you need. I think 15 years takes a good shot at expanding what exists already on the 10-year limitation of keeping data in the system, but long enough at least to give us a good idea of the pattern, the substance we're looking for, and gives us substance to work with. I'll remain at 15 years.
On October 26th, 2017. See this statement in context.