Cyril Scott, often called the 'English Debussy,' blends impressionist colors with a traditional waltz structure. The piece is characterized by chromaticism and a fluid, rhythmic flexibility.
Achieving a graceful, flexible waltz rhythm that avoids becoming mechanical is key.
Comparable difficulty and character — good candidates for what to learn next.
An English Waltz is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 7.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of An English Waltz lasts about 4 minutes.
An English Waltz is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Berceuse by Cyril Scott, Autumn Idyll by Cyril Scott, Blackbird's Song by Cyril Scott — see the full similar-pieces list on this page.