Ok, I'm sure I'm being stupid here..
FTTC is available for me now & has been for about 2 weeks.
I've logged into the customer portal and clicked on upgrades but I'm not seeing any FTTC options.
(http://psp83.co.uk/pics/upgrades.JPG)
???
I've just emailed support to upgrade.
It was the same for me although mine was available before the rfs date.