Mr Miles said that the optimal ratio of core tier one equity capital to risk-weighted assets would be 19%.
It says that, by applying today's rules, RBS had core tier one capital of only 2% by the end of 2007.
And then it assumes the banks would need to preserve a core tier one ratio of either 7% or 8% on these stressed scenarios by the end of 2012.
The bank's profit number beat consensus forecasts by about 5 per cent, and the core tier one capital ratio -- a key measure of financial strength -- was also slightly ahead of expectations at 12.3 per cent.
The bank was able to point to progress in shoring up its capital, reporting that core tier one capital if incoming Basel III banking rules were applied had reached 8 per cent, three months earlier than planned.
In order to support high levels of wholesale funding, UBS says, banks may need to demonstrate levels of core Tier one capital, which is effectively common equity, well in excess of the levels most Eurozone banks currently hold.
Analysts believe the lender could have a core tier one capital ratio of close to 20 per cent initially, falling to 9 per cent -- the level required by the troika agreement -- in three years' time once losses have been incurred and recognised.
On Dexia, it was only on July 15 that the European Banking Authority disclosed that this retail and public-sector finance bank would have a ratio of core Tier One capital to assets of 10.4%, even after incurring notional losses from harsh simulated financial and economic conditions.
He refused to be drawn on what the final outcome would be, but he did not deny that expectations of banks such as HSBC that they'll be forced to hold what's known as core tier one capital equivalent to around 10% of risk-weighted assets are in the right ballpark - or about 3 percentage points more than the new 7% minimum for all banks.
Its core, tier-one capital, at 6.2%, looks low, but the reduced dividend may help shore it up.
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