The army do not have telegraphists, they have signallers whose badge is crossed signal flags.
You are technically correct when speaking about
today's British Army, but you are wrong when looking back beyond April 2020 to around 1970. During that period the Royal Corps of Signals had three trades which incorporated the word telegraphist: the data telegraphist ( a keyboard operator), the radio telegraphist (able to send and receive Morse code mainly over HF radio) and the special telegraphist (an intercept operator who could read the varieties of Morse code employed by some other nations). In today's terminology, the rank of signaller is a private soldier (male or female) in the Royal Corps of Signals. The title signaller can be used as the job description of any soldier in any other combat arm, especially the infantry and armoured corps, whose job is to establish and maintain communications within their unit. In an infantry battalion they would be part of the signal platoon in headquarter company.
