any deffinative reasons this would be happening^^ im thinking rings are starting to wear or worse, have mayo in cap aswell though so a tad confused at the mo if its hg aswell any ideas?
Have you changed the oil? If not, there is a chance that the old stuff has picked up moisture which the engine is trying to evaporate: the only place it can go is out the breather (unless you remove the cap).
This cold weather is a bugger as well, my car hasn't used a drop of coolant in the last 1000 miles but you wouldn't believe the amount of water i'm getting out of catch tank especially when it's doing short runs (no mayo in the cap though) it can only be condensation.