I believe the welsh assembly / central goverment are working on a plan to remove the tax disc in it’s paper form, it’s about time, as it’s logged on the computer if u have tax or not (hence the bar code on ur letter) they scan it in when u buy at the post office, and if u buy online ofcorse it’s logged
we have a very old law about “displaying” tax, even if it’s paid for, on computer and not on show, you can be booked. This is being looked at, so u don’t have to display, the problem with this is, they will sstill have to send letters untill people get used to going online to buy