If I remember an ancient issue of DWB correctly, which had a feature on the original script, Davis *didn’t* write the Voga material in Revenge of the Cybermen. The original was all “base under siege”, with very limited sets. The expansion to Voga was all Robert Holmes, after the decision to make it back-to-back with Ark in Space freed up resources. Davis wasn’t best pleased, IIRC.
If I remember an ancient issue of DWB correctly, which had a feature on the original script, Davis *didn’t* write the Voga material in Revenge of the Cybermen. The original was all “base under siege”, with very limited sets. The expansion to Voga was all Robert Holmes, after the decision to make it back-to-back with Ark in Space freed up resources. Davis wasn’t best pleased, IIRC.