Cervelo R3 2013 headset

sopworth
sopworth Posts: 191
edited July 2014 in Workshop
As per the title, I'm needing some help on the issue.
I've just picked up a second hand frame and forks but it came without a headset. It's an inter grated, tapered headset requirement.
I've spoken to the original supplier of the frame and another big chain store and both say I need to go to the supplier for an FSA one. Has anyone bought and replaced a headset for this frame? If do, what and where can I buy one?
Thanks,
S