It seems the main badger group for Sussex is:
Badger Trust Sussex
Historically there have been several badger groups in Sussex, including
these listed below. The West, Mid and East Sussex groups seem to have
merged into the Badger Trust Sussex; so the above numbers are the ones
to phone, unless you are in Hastings or the South Downs.
If you are on the edge of Sussex, you might also like
to contact the following groups: