I like all your ideas Lizzie.
If you are legal you won't have a problem, that way the vast majority of people would be legal, there will unfortunately always be people who will find a way around any kind of rules and regulations. The only serious issue I can see is the increase in fuel thefts from cars.
That is fine until you have and RBS style technical problem and nobody can get fuel for a week due to computer problems.
Also what happens when you are on a long journey and you realise when you go to fill up 300 miles from home, that you have left the swipe card there?
You should always carry your driving license and insurance details, along with the means to buy the fuel, with you in your purse/wallet/handbag. The swipe card should be kept with those. If carrying all those documents with you was made legally obligatory, as it is in other countries, then only illegal drivers would be caught out. The police would also have an easier time when stopping an illegal motorist, and there would be no need for the ridiculous rule of providing your documents to a local police station within 7 days; criminals just disappear into the night! This way they can be arrested for a specific offence immediately. 
<sarcasm>
Why don't we issue everyone with identity cards and make it legally obligatory for eveyone to carry it at all times? That would make things easier for the police. They could just stop people and ask to see their identity ("Papers, please") and if they don't have it on them arrest them on the spot. That would get a few criminals off the street.
Or better still, tattoo everyone with an ID number, maybe on their forearm.
BTW, these ideas aren't original.
</sarcasm>
No, that idea is too crude now. What with fingerprint, face recognition, DNA analysing, and electronic tracking, it is not necessary now!