You are correct - an error or typo on my part. It should be the T1 / Mk.XIV sight. Hinted at by mentioning the computer, but typed the wrong number !!
I'm still away from home, so don't have access to my references, but as far as I know, the British Mk.XIV sight was fitted in the UK, along with British radios and other equipment. For the purposes of a model, either the T.1 or Mk.XIV would suffice, there being little, if any, visible external differences.