Cyril Scott's piano works often blend late Romantic lyricism with impressionistic harmonic colors. This piece is a miniature that relies on character and expressive nuance rather than virtuosic display.
At Henle 4 this is an intermediate piece that expects secure technique and real attention to phrasing. The main demands: chord voicing — bringing out one note inside a handful of others; rubato that must breathe naturally without losing the pulse; and a true singing tone, with the melody floating above the accompaniment.
Pay close attention to the dynamic shaping to highlight the character shifts in the theme.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Lesser-known works by the same hand, at a comparable level.
Don't Come in Sir, Please! (Op.43 No.2) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
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 Don't Come in Sir, Please! (Op.43 No.2) lasts about 2 minutes.
Don't Come in Sir, Please! (Op.43 No.2) 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 Columbine by Cyril Scott, An English Waltz by Cyril Scott, Berceuse by Cyril Scott — see the full similar-pieces list on this page.