From today's Guardian reporting on the same matter.

"Large fixed penalties awarded irrespective of the individual’s circumstances “risk being inherently unjust” and the current system “criminalises the poor over the wealthy”, the committee members warn.

They say there should a graduated approach to FPN amounts and people should not face a criminal record for non-payment, questioning “why a breach of the coronavirus regulations would be relevant to someone’s future employment prospects or ability to travel to certain countries”."

All Covid fines in England should be reviewed say MPs

I think if these cases go to court quite a few will end up being dismissed.