Answer: Cricket.
NatWest was a British bank that sponsored an annual one day cricket series in England from 1981 onward. Before this, the same tournament was known by other sponsor names such as the Gillette Cup.
Over the years, teams like India, Pakistan, Sri Lanka, Australia and South Africa took part in the NatWest series. The event became a regular part of the English cricket season and produced several memorable matches between England and visiting sides.