Steve Turner, Graftgold MD, writes in a review at AGDB:
"Graftgold almost developed a game for Microprose, in some ways inspired by Gunship. It was called Battle of Britain and contained strategic and shoot em up elements. It got as far as the design and mock up stages but the contract was never finalised so the game was shelved. It was going to be our first big 16 bit game across Amiga, ST and PC. Some of the ideas, especially the maps and display engine, ended up in the game Realms."