To some bowlers in Somerset, the Turnbull Cup is the pinnacle of the bowls season, despite the success of the County League since it's formation in 1999. The Turnbull Cup was presented to the County by John Turnbull of the Bristol Club in 1919, initially as the trophy for the winners of the Pairs competition and a year later as a fitting trophy for a rinks championship.
Thus the Turnbull Cup competition began in 1920 and is a knockout, with 4 rinks per side, the highest aggregate score accross the 4 rinks deciding the winner of each round. First round losers enter the Wedmore Plate, played under the same format. Later rounds including the final are played on neutral greens.
Bloomfield always enter the Turnbull Cup, but its probably fair to say they have rarely fulfilled their obvious potential in this competition and have never reached the final stages.