Re: I just don't understand the need for the concept to be honest
"The Tyne Tunnel needs cash, or more rather change, to let me in (or out!)"
Not any more! 10% discount for using a pre-paid tag on the windscreen. Sort of a PAYG thing, unlike the old permits which required you to use the tunnel both ways at least 4 days a week to make it economic. Interestingly, you can pay by card online to top up, but if you cancel, they will refund you by putting a cheque in the post. Technology? We've heard of it.
One down, 400 outlets more to go :-)