BSL interpreters are recommended to register, in order to be part of an ethical body, who can regulate the work they do, and provide accountability and a grievance procedure to clients.
"NRCPD exists to protect the public by regulating communication and language professionals who work with deaf and deafblind people. We hold Registers of interpreters for deafblind people, lipspeakers, notetakers, sign language interpreters, sign language translators and speech to text reporters." NRCPD.org.uk