Agilent responded to the U1272A problems within 3 weeks, and have a nice present for all current owners to boot.
Mini rant time too - Manufacturers take note, this is how you respond to problems and keep customers happy.
Here is the Agilent notice:
FLUKE RESPONSE:
No surprise really, Fluke have responded.
I got a call from them and they have not only fixed the GSM problem (official explanation, they found a few RF sensitive components), but a new revision board is being tested as we speak.
I'll hope to have a lot more on this a later date...
So although they didn't get back to us on the progress, they have been head down bum up fixing it. Good to see!