The following games are known (or thought) to have been written by Robert R. Rowlingson
Caveman (1st April 1984) (Spectrum 16K) A simple game set in the mines. You must load your cart with gold and push it to the surface; however the Troglodyte patrols the mines and must be avoided.
Items:
Caveman (24th August 2015) (ZX Vega) A simple game set in the mines. You must load your cart with gold and push it to the surface; however the Troglodyte patrols the mines and must be avoided.