Re: Financial details?
Although why do they hold date of birth?
Probably so their marketing department can avoid promoting sanitary products to the over-sixties, incontinence pads to the under-thirties, tampons to men, and beard-trimmers to women.
Because when they make those mistakes there's a whole load of people waiting to criticise and ask why they didn't just store date of birth and other details to avoid such things.
Us Brits have always been able to find something to moan about. These days it seems looking for something to moan about is a hobby in its own right for many; it's damned if you do and damned if you don't.