Your best plan is to )LOAD buildse and run
BUILD_SESSION 'UK'
which will build the default session file for a UK environment. The full list (currently) of supported languages is UK, FR, IT, FI, US, RU and GR (German!).
This workspace is a copy of the one used by our build process to build the session files which are supplied with the product for all versions and all platforms, and can be used at any time to reset a session file.