My experience with a Carron mixer tap was that I started with water coming from the base of the pillar.
Took it apart and cleaned everything up, put it back together and the seepage from the pillar had stopped but I had a very drippy tap. Again took it apart and I had a small rubber washer and 2 plastic discs loose in the tap, It didn't take long to realise that all that was required was 1. a new rubber washer and/or 2 tighten the tap up a bit more. A most pronounced leaky tap has just got completely eradicated thanks to a small extra turn on the tap with a mole grip.
Hope this helps somebody.
Delmar264
July 2013