In message , Dave Newt
writes
In a way, I am glad there wasn't any prepay on it, since I don't know
how much it would have deducted!

It wouldn't have mattered if there *was* or *was not* Pre Pay on it, if
the validators had been working you'd have been charged £1.00 anyway.
No Pre Pay at all and it's a debit (shows as -£1.00)
Any Pre Pay amount at all (say 20p) and it would show -£0.80 or
whatever.
Pre Pay is enabled on ALL Oyster cards... except ours it seems.
--
Kat Me, Ambivalent? Well, yes and no.