A total of seven clock bells , 14 change ringing bells and 22 carillon bells are lodged in the towers . The south-west tower holds 14 bells ( tenor 59 cwt or 3 tons ) hung and rung for change ringing and 22 carillon bells ( tenor 23 cwt or 1.2 tons ) which are played from a batonkeyboard in the ringing chamber . ( all together 35 bells . )