Brislington have confirmed the departure of Charlie, who captained the club's senior side and is now moving on to play at Step 4 level.
The club said he had captained the team "through a challenging period showing the commitment, character and leadership that make him such a special player to have had at this club".
In a second post, Brislington said he had represented the club "from the age of six to the senior team". The club added: "You're always one of ours, Charlie. Best of luck with the next chapter. This is goodbye for now. Once a Fox, always a Fox."