BBC report today.

An analysis of 2018-19 showed about £199m of fines had been issued - but only £33m had so far been paid, with £46m for people who were exempt but mistakenly fined, £18m cancelled and £101m unpaid.
I wonder why so may NHS fines are being wrongly issued? Oh, this might explain it-

The outsourcing company Capita was used for some of the fining and debt collection for dental treatments.

The National Audit Office said Capita keeps 100% of the fines and surcharges - with the NHS receiving the value of the treatment.

If fines are not paid, another company in the Capita group is used as a debt collector, keeping almost half of the money recovered. The contract is due to finish in December.