Sorry to be a pedantic git again lol. No.1 Station was by my good friend Mr Dennis Alcapone (ok Gordon, stop effing namedropping - Ed). Also Bluebeat was the main label at the time for UK issues along with the others (and R&B which stood for Rita and Benny (King) two of the first retailers of JA music in the UK).
Jackie Opel didn't record much in the rock steady style (which is a shame IMO) as he had gone back to Barbados in late '66, where he got involved in a local Bajan music called "Spouge" which was like a hybrid of ska and calypso.
The first place to look in rock steady is to get tunes by the vocal trios of the time - the Paragons (as mentioned), The Techniques, The Melodians, The Heptones, The Sensations, The Gaylads, The Royals, The Ethiopians, The Emotions, The Clarendonians and many more. Then you've got the great singers like Slim Smith, Bob Andy, Pat Kelly, Ken Boothe, Alton Ellis, Carl Dawkins, Busty Brown and others.
Hope that helps.
Gordy