Asda has made a strong start to 2009, regaining its familiar cheapest retailer title and undercutting nearest rival Sainsbury's by £1.13.

Asda's £58.26 basket boasted five promotions - the most out of the five retailers, as well as a whopping 26 of the cheapest or joint-cheapest items. There were no price hikes and Anadin Extra was down 6p, Kellogg's Optivita 2p and the Old El Paso Fajita Dinner Kit 1p.

It was a strong week for Sainsbury's. The second-placed retailer leapt two places to second with the help of new promotions on cauliflower, down 40p, and Kleenex for Men tissues, down £1.76. The retailer had 12 of the cheapest or joint-cheapest items and just one small price hike, upping bananas by 4p per kg.

Despite two new promotions and 11 of the cheapest or joint-cheapest items, Morrisons slid two places to third. Goodfella's Solos Margherita Pizza was down £1.29 and Kleenex for Men tissues by £1.76. There was also a 2p cut on Mr Kipling's Bramley apple pies. The retailer upped two items, however, bananas by 4p per kg and skinless chicken breast fillets by 20p per kg.

Prices were on the rise at Tesco, which resulted in the retailer sliding from third to fourth place and its £61.78 basket totalled £3.52 more than the cheapest retailer's. There were two significant price hikes, Goodfella's Solos Margherita Pizza by £1.15 and chicken tikka/korma with rice by 77p, after promotions ended. The retailer reduced the price of five items, however. The price of Mr Kipling's Bramley apple pies was slashed 33p and McVites Jaffa Cakes 12p, due to promotions. McCain Home Oven Fries and croissants were also down 2p and bananas by 4p per kg.

Waitrose proved again the most expensive retailer with its £69.55 basket costing £11.29 more than Asda's. None of the 33 items were on promotion and it had just two of the cheapest or joint-cheapest items. Anadin Extra was down 15p and the in-store bakery wholemeal loaf was up 10p.