The last bit is don't go off making dinn er and miss your 10 minute slot.
The rest, and I am guessing is the main URL as the Queue ID is as you say just a number.
If that works then in theory you will be back in the booking screen as the system knows you are in your 10 mi ute window but until you do it it is guess work
I was already past trying to enter registration numbers, it kept saying all tickets allocated but if I clicked back eventually it let me enter them again