The latest in our how to mend series can help you save water, energy and cash with household tools and simple spares You will need:A slot or cross-head screwdriverAn adjustable spannerAssorted washers or replacement cartridge There are essentially two types of tap: traditional taps and monobloc lever taps that control flow and temperature with a single handle. Traditional taps drip because an internal rubber seal, or washer, has perished and needs replacing. Monobloc level taps have ceramic cartridges that occasionally need to be replaced. The more expensive the tap, the more extortionate and elusive the replacement cartridge. 1. Before you attempt to fix the leak, either turn the water off at the stop cock (if you don’t know where yours is then it’s important to find out) or turn off the isolation valve. This is normally found on the supply pipes below the sink. Now turn on the tap again to release any water left in the top of the pipe. 2. The first challenge is finding the screw inside the handle that holds the tap together. It is generally hiding under the decorative cap on top of the tap handle. Sometimes you can unscrew the cap by hand, or you may need the help...