Glad to hear George is doing OK at the moment, what a mammoth thread
Maybe your vet could try speaking to Iain at Vet UK, they are very helpful and might be able to order some of this special insulin in for George so that you can get it quicker. Their preferred contact is by email but I have always had a response within 24 hours...
From the website:
"If you have a question about prescription only items that cannot be answered after looking on the POM home page, or you would like a price for a POM you use but cannot find on the site, please email us selecting "prescriptions" from the dropdown menu box below: or click here prescriptions@vetuk.co.uk "
Almost forgot, Tiggy sends a healing head kiss George's way