Rozsa is a deliberate and very slinky waltz, maybe not what you immediately think of as a very English dance but it is most thoroughly so... You may see it described as the 'Rosa Waltz' but it was originally Rozsa.
The source taken from the the sleeve notes for the Committee Band's Dancemusic CD
Stocai have a Rosa written up (one where you chassé 4 steps right first instead of left) and there's a version escaped into the Irish trad repertoire. It's the folk process in action.