Effective 2017-12-15, the identifiers of lineups in GBR are being changed by our outstream data source.
We were trying to perform dynamic re-mapping of the old lineup names to the new names, but there are too many variations to effectively ensure that there was full coverage.
Members with the old-style GBR-000* lineups will have those lineups removed from their accounts and you'll need to use your application to "Add a headend" again. The new lineup options will have greater granularity for regional variations.
for more info see THIS forum post.