I am on the Wokingham exchange and have had FTTC through Aquiss for about 6 weeks.
I had the same issue with BT Infinity saying it was not available and it is because the BT estimate for my line was 11.6Mbps. I actually get 30Mbps down and 10Mbps up.
BT Retail will not take orders for Infinity if the estimate is below 15Mbps, if your estimate is also below 15 then either you will need to find another ISP rather than BT or wait until they release a sub 15Mbps product. I still get the BT emails saying how sorry that they are that it's not available when I already have FTTC enabled.
If you use
http://www.btwholesale.com/includes/adsl/main.html this will tell you what the BT estimate for your line is. If it doesn't recognise your phone number use the postcode checker.
I migrated from Sky because they don't seem to have an FTTC product anytime soon. I suspect that my 1 year contract could be up before Sky have anything but considering how good Aquiss have been I'm not sure I would go back.