I've been working in the industry for 6 months, and so far I've learnt that having a data-of-birth, post-code and surname is all you ever need. ..and that for

I've been working in the industry for 6 months, and so far I've learnt that having a data-of-birth, post-code and surname is all you ever need. ..and that for twins, having the same post-code can be fatal..