In the Hachette collection, Davis and Edginton say they'd be quite up for doing more Ampney, and both agree it didn't really end in a satisfying way. But promises were not made!
Frankly its lower on my wishlist than Thistlebone, Helium and Brass Sun. But, givewn the inter-dimensional aspect to Ampney Crucis, I can well imagine the character (and his trusty batman) showing up in any given Edg-verse series. I suppose if Stickleback ever ends up digging tunnels into a Prep school he might meet a young Crucis snaffling pies while avoiding a well-earned caning.