Is there a time limit to make a group B streptococcus compensation claim?

Yes; the ‘limitation’ period to bring a claim for medical negligence is three years from the date of injury, or in some cases the date of knowledge of the injury.  This means that if you became aware of the injury or diagnosis weeks, months, or even years later, the three-year period would have commenced from that point.  In rare circumstances, the Court may use its discretion to extend the limitation period, but only for exceptional reasons.