Standard Life, the troubled insurer, is to consider selling its banking business and its Canadian operations or even selling itself as part of the strategic review it launched last week.The insurer owns two major subsidiaries that are not part of the main UK life and pensions business. The best established is the Canadian pensions operation, which in 2002 had a turnover of £1.25bn, down from £1.4bn a year before. It is believed to be worth more than £500m. Younger, but potentially more valuable, is Standard Life Bank. Launched six years ago, it already has a mortgage book of more than £8bn and has drawn in savings of more than £5bn.