The card should have a serial number on it. That's it. Maybe a name so that people don't get their cards mixed up.
Surely the people working on the national security of the UK are smarter than little old me.
PS: As to why you would want a device that can work without a network think terrorists taking down the network, classic government incompetence, or just lower costs.
On that subject, has anyone done the numbers on the number of people that would be saved by putting the same money spent on anti-terror bullshit into the NHS vs the number of people saved from terrorism?