Re ID cards, I actually support the introduction of these. We have them here and it really makes life easier. You should carry the card at all times, most people stick it with their phone now days.
Want to open a bank account, you don't need electric bills etc etc you just use your ID card, it states your home address on it.
If you move house you apply for a new ID card (free), the only thing that changes is the address - you have 14 days to this.
Want to sign up for a cell-phone w contract - use your ID card, no other docs needed.
Want to prove you are over 18 to buy cigs/wine - the card is the one of only two allowed IDs, the other is a foreign passport
Want to buy a car from someone knowing that they are who they claim to be - ask to see their ID card, no card = no sale.
Want to rent a house out? Take a photo of their ID, will make potential future issues easier as if they leave and rent someone else you can get ask court to access their new address in order to recover arrears.
The ID number is their NHS equivalent number, any company that employs them, school, uni whatever will make a copy of the card and the number follows them for life,
All foreigners who gain residence (students, workers, spouse) get a card/number too which is there number for everything.
Using someone else ID is v serious and prison sentences start at around 5 yrs.
Lost ID cards have something like a 85% found and returned rate, if you find one you take it to the local PO who register post it back to the person free of charge.