It's unlikely to be leaking from the base of the tap - more likely that it is either dribbling back along the underside of the spout or leaking past the spindle - you havn't said what type of tap it is but at a guess you either need to change the tap washer(s) or the ceramic discs
We had this problem in our "new" bathroom. My husband loosed the tap from underneath, put sealant around the stem of the tap and pushed it back in a tightened it up again and it has been fine.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local