Filming Locations for 6.1

Ep. Lets Kill hitler:
Bute Building
Cardiff University, King Edward VII Avenue, Cathays Park, Cardiff, CF10 3NB

Temple of Peace
Welsh Centre for International Affairs, Cathays Park, Cardiff, CF10 3AP

Brangwyn Hall
Guildhall, Swansea, SA1 4PE

Cyfarthfa Castle
Cyfarthfa Park, Merthy Tydfil, CF47 8RE

Mir Steel
Corporation Road, Newport

Hope this info comes in handy