NAB has been a perennial suitor for British banks, including Alliance & Leicester and Bradford & Bingley, but has never made it to the altar. With a market capitalisation of A$52bn (£18.3bn), it has the firepower to swallow a substantial UK bank. Its share price has improved by 26% this year, reflecting the view that investors have forgiven its disastrous foray in US mortgage lending, which cost it A$4.4bn in write-downs. The marginal strengthening in the Australian dollar would also help in any bid. Earlier talks with Abbey foundered because of 'cultural differences', it is thought.