Carer could go and cash in his pension to give him cash...... 
But in this modern world how about paying via PayPal, even if you have to do it for him, can be done from anywhere....... 
Might not come to any of this. The whole saga has been one of immense frustration and sadness. For 91 years he has not been a burden to anyone. He fought heroically on many famous front lines and avoided death inumerable times during the second world war and now he has been passed from pillar to post without joined up care and attention from the whole health service and from social services. Mrs V has been tearing her hair out for the last three weeks.
Just one example.
It took three days to discharge him from hospital. No one seemed to know what was going on and when. On the second day , having waited all day yet again, Mrs V was advised he will be leaving hospital at 7a.m. on day3 She is there at his house waiting. He arrives at gone 1p.m. dispensary couldn't dispense his drugs.......
Social services are ...... No named point of contact. Never speak to the same person twice. The whole story has to be told each and every time. No one can advise what can be done only what they cannot do. You are speaking to the wrong person, I'll get the right person to ring you. When will that be? I don't know, I don't run their diary. Two organisations designed not for customers but for themselves.
Own GP? They visited in the end, rightly prescribed painkillers for disintegrated vertebrae but the guy had no understanding of what had been prescribed and no way of getting them.
Anyway his medical condition and state of mind will probably shortly rule out living at home. We will see in the coming days.
Thanks for the suggestions re money, cheques,Paypal.. We could order food,consumables to be delivered weekly from Asda from Spain.
I read that in the UK more than 50% of folk over 75 years of age now live alone. I bet there are other people in the same boat.
<sadness off>