Many people don't trust oyster cards because they have no control over
what is being deducted from them and cannot see there and then what
actually has been deducted.

We seem to be talking about buses and with those, and with the trams, the
reader tells you what the fare was and how much credit you have left. I've
never bothered to take a second look at the tubes.

If an oyster card was swiped on a bus and
then
the person was told that he'd have to swipe again because it failed, how
will that person know he hasn't been deducted twice?

You know when it has worked because you get a green light and the message as
above. So it shouldn't be an issue.


How would the person
know that the correct fare has been deducted from the card (i.e. was the
time exactly right on the oyster reader?)

Again you know how much has been deducted because the reader tells you.

The time being wrong could indeed be an issue and already is for other
things. My Mum has been denied boarding to buses on her Freedom Pass
because the driver insists it is too early due to his having the wrong time.

They're trying to force people to use oyster cards, but, unless they've
changed it, according to the leaflet they're also charging people £10 for
the oyster card.

It is a £3 refundable deposit.

G.