So far as I can make out the Bulgin SA2404 has a keyway, I can't see a keyway in the one in the photo as posted...?
Link to Liniplex F2 review, Shortwave mag...August 1989, starting mag page 20:
https://www.americanradiohistory.com...WM-1989-08.pdf
Looks like the batteries and ac adaptor were internal...?
Lawrence.