Sainsbury's has embarked on a number of new store initiatives to improve efficiency and cut costs as it tries to up its game to reach £440m of savings and £2.5bn of extra sales by 2008.

Trading director Mike Coupe intends to make the 'power aisle' - the aisle which runs the length of the store and cuts through the middle of the vertical rows - a key focus this year, having failed to improve it in the past 12 months.

In addition, it has kicked off a 'lean store' drive to improve customer and staff engagement and drive out unnecessary costs. Savings from reduced loss and waste is one priority, while at the same time increasing sales through availability.

Sainsbury's has also completed an 18-month full category review. The process is intended to simplify ranges, remove duplication and poorly selling lines, as well as rearranging the categories to improve displays.

"Nearly 80% of the categories have already achieved market growth," said a spokeswoman.