Germany:
Arzheimer, Kai; Berning, Carl, 2020, "Sub-national context and radical right support in Europe (SCoRE)", https://doi.org/10.7910/DVN/X8K8L3. (Dataverse, without geo-references)
Arzheimer, Kai, & Berning, Carl C. (2024). SCoRE - Sub-national Context and Radical Right Support in Europe. GESIS, Cologne. ZA8767 Data file Version 1.0.0, https://doi.org/10.4232/1.14215. (via gesis, without geo-references but with better documentation)
(geo-referenced version of the German data to follow)
United Kingdom:
Evans, J., Gould, M., Norman, P. (2019). Drivers of Populist Radical Right Support in Britain, 2017-2018. [data collection]. UK Data Service. SN: 8474, http://doi.org/10.5255/UKDA-SN-8474-1