Supermarket chain J Sainsbury today showed its recovery was firmly on track by posting a surge in sales.

The group, which has been attempting to reassert itself in the face of stiff competition, said like-for-like sales for the 12 weeks to March 30 were up 6.8 per cent, excluding petrol.

Sales were boosted by the chain's advertising campaign starring TV chef Jamie Oliver and strong demand for the upmarket Taste the Difference range, while Easter contributed 1.5 per cent.

The final surge helped underlying sales growth for the year as whole, again excluding petrol, reach 6.3 per cent.

Chief executive Sir Peter Davis said: "This is clear evidence that our strategy of upgrading our store portfolio, combined with offering outstanding quality and great service at competitive prices, is being well received by our customers."