Kitchen tap has been dripping on and off for many months (?years)- have had a plumber look at it some time ago and replaced washers etc but I think it needs replacing. Husband says "I couldn't see a join for detaching the "tails" with a nut, so my concern is that the tails are just copper pipes that have been welded/ braised in place." NB there appears to be no flexible pipes under the current taps.