HMRC clampdown makes avoidance a high-priced risk
Govt and regulators 'must work together'
Interventions have 'dramatic effect' on organisation
Questions raised over fees and liability
A controversial decision by the Financial Conduct Authority (FCA) to drop its investigation into the culture at the UK's biggest banks was overseen by a Bank of England (BoE) official, according to reports.
'A very real and very interesting challenge'