It seems to be about the closest to cream you're going to get. Tbh it still looks a little too bright for a vintage look but I guess it would get grubby on the roads so it'd be less obvious after a while - at least it's not bright white, though, which is what you need. Couldn't find a UK stockist for it.
Oh - suddenly remembered the other thing. After many hours of searching I did eventually find this Campy "pearl" stuff:
http://www.velomine.com/index.php?main_page=product_info&products_id=720
It seems to be about the closest to cream you're going to get. Tbh it still looks a little too bright for a vintage look but I guess it would get grubby on the roads so it'd be less obvious after a while - at least it's not bright white, though, which is what you need. Couldn't find a UK stockist for it.