On: Why are so many people being hit with £5 fines for...

[IanCal]

> It links to identity of whoever purchased them with credit card.

How do you think this happens? The codes are not scanned at the shop.

> when transaction for these stamps was registered.

Where is this registered?

[robk → IanCal]

I'd bet money in a forensic scenario they could look up the batch and then estimate the sequence and thus date of sale and pull the post office cctv footage.