Urmstongran Yes, she's on the electoral register to pay council tax, but not eligible to vote because she still has Danish nationality. Yes, she has a UK bank account, but apparently that doesn't prove residence. My daughter still has an Irish bank account from the time she lived in Dublin, but she hasn't lived there for years and doesn't have Irish nationality. Being registered with a doctor's surgery doesn't prove residence either, nor does having children born in the country. With the help of her family, I'm sure she will eventually get it sorted, but it really isn't a simple and straightforward as you seem to claim. Some of the people affected are on their own and some are suffering from dementia. As a solicitor, I would have thought you would appreciate that some people just don't always fit in the square holes the government seems to think they should, even though they have done nothing wrong.
Maybe you could explain to people like my mother's friend what advantages there will be from leaving the EU.