<sod >Shares in RBS have opened 2.3 per cent lower at 192.5p, while Barclays was down 0.3 per cent and Standard Chartered is 0.4 per cent lower.< eod>< sod > Shares in RBS have tumbled by nearly 3 per cent in early trading, while Barclays was down 0.3 per cent and Standard Chartered opened 0.4 per cent lower.< eod>