The downloadable score below is from www.imslp.org.

In the Trinity edition, the first RH chord in the Coda (bar 41) is middle C with an A, a major 6th above, which is what I play.

The Goblin and the Mosquito is on both the Trinity Grade 4 (from 2023) and ABRSM Grade 4 (2025 & 2026) syllabuses.