The primary aim of this work is thus to augment the existing cc-pVnZ-PP-F12 basis sets for the heavy p-block elements (Ga-Kr, In-Xe and Tl-Rn) with additional higher-angular momentum diffuse functions to improve their performance in calculations on anions. Section II describes the basis set development and optimization process, including that for the required ABSs. Sections III and IV then describe the computational methods used and the results of the in-depth benchmarking of the new basis sets for calculating electron affinities.