The most recent augmentation was in 1999 when an additional seven bells were added to the ring, giving a grand total of 20 bells - 19 swinging bells (the world's highest number of change ringing bells) and one chiming bell, cast by the Rudhalls. Although this does not produce a diatonic scale of 19 notes, it does uniquely provide a choice of combinations: three different 12-bell peals (in the keys of B, C# and F#) as well as 14 and 16 bell peals. At the time of the augmentation, this was only the second 16 full circle bell peal in the world – St Martin-in-the-Bullring, Birmingham being the first.