It could just as well be a tax embezzlement, corporate fraud, death by dangerous driving, high value theft, peopl etrafficking, drug dealing, robbery, etc etc etc.
Why are you worried? It just shows you are a citizen of good standing who is on the electoral register.
Honestly, it is nothing to worry about. Just a bit boring sometimes.
I have sat twice on jury service (local) however. One was a conspiracy to defraud a building society and the other a simple handling charge over some commercial lawnmowers. Yawnnnnnnn I wanted a murder!!!!!