So happy to see your update this morning on Monty! That is fantastic news indeed. Now we pray that they can find the cause, because once you know that you can make sure it doesn't recur. It's a great idea to have him checked out with another vet too for a second opinion, especially if the cause is in any doubt.
I loved the description of Monty's reunion with Mr. B! That, and seeing you today, will be the best medicine he can have. Sending lots of positive thoughts across the pond for continued good news! Once you're home and can relax a bit, please get some rest! These things take a huge toll on us as well, and you need to take care of you too!