Chris Salmon, the executive director for banking services and chief cashier at the Bank of England, on Tuesday discussed some of the new security features used in the bank's latest banknote series.

At the British Numismatic Society, Warburg Institute in London, Salmon said: "Advances in technology have revolutionised the mechanics of the design processes. The era of pen and ink design is increasingly being replaced by computer-based processes. And, nowadays, such is the rate of technological