At the beginning of the new year, as you may have been thinking about how to regenerate parts of your business, or cut staff, or plan a new career, one former trader was having a more dysfunctional time: waking up in The Verne prison on the Isle of Portland in Dorset.

After a 10-week trial last year, Kweku Adoboli hardly needs an introduction as the UBS trader who lost $2.3bn betting the wrong way on the bank's ETF desk in London. He was sent down for seven years.