It’s an aerobatics-rated light side-by-side trainer and light-fun-to-fly thingie. Composite structure, fixed landing gear, and either an 160hp or an 180hp Lycoming engine. It’s somewhat in the same class as the Bulldog and the Firefly, but it looks a bit sleeker. The Royal Navy should have a few (though contractor-operated, no military serials on those) for pilot screening as Chipmunk replacements. The pic should be one of them – which is indeed specifically the D2 variant.

Grob is quite an interesting aircraft builder, by the way. Initially a glider-only factory, they have also began designing composite light aircraft and an extremely interesting recon/survey platform, the Egrett, which actually looks like a strange mixture between a U-2 and a turboprop-Skyraider.