The British Atmospheric Data Centre (BADC) is the Natural Environment Research Council's (NERC) Designated Data Centre for the Atmospheric Sciences. The role of the BADC is to assist UK atmospheric researchers to locate, access and interpret atmospheric data and to ensure the long-term integrity of atmospheric data produced by NERC projects.
Depends on source. See access rules and ASCOE data protocols. Some providers stipulate that data may only be used for personal research purposes, and some explicitly state cannot be used for commercial purposes.