Reluctantly, I'm pulling out of this, sorry about that.
It would be illegal for us to cross into Wales. It may or may not be illegal for us to cross into Scotland - I can't tell**
I plotted a new route merely touching the borders of Scotland and Wales without crossing either but, with all the T3/T4 dodging, it would be a lengthy and dull ride and I'm going to do a longer but more interesting (and entirely legal) ride to visit my daughter in Cornwall instead.
If your bookings are cancellable you have until 1300 today to cancel Norwich and 1300 tomorrow to cancel Dumfries.
Go for a fun, legal, ride by yourself
** I can't tell whether or not a simple act is illegal. Me, chief pedant!