......Someone somewhere along the line didn't know what they were talking about and cost all of us a lot of money.
Have they been sacked / re-trained / reprimanded / put out to pasture ?............
Well, with UK employment laws, you can't really sack people for just making mistakes.
'Lack of training' is often the excuse offered by employees when making a mistake. It's an easy excuse to make and automatically puts the onus on the employer.
A 'reprimand' seems fair, but management know that the person being reprimanded is only likely to sulk and work even less well in the future.
Putting out to pasture might be a the best option. Early retirement on a good pension will keep everyone but the taxpayer happy.
Then the whole sorry saga can be brushed under the carpet and forgotten.