A Sainsbury's spokeswoman said it was "looking at service levels and efficiencies" on Sainsburystoyou.co.uk. It is experimenting with offering free midweek deliveries for larger orders. The service is currently available to 74% of UK households. "That might increase a bit later in the year," added the spokeswoman.
Sainsbury delivers from 71 stores nationwide and one picking centre at Park Royal, London.
A spokesman for Asda said it hoped to be able to resume roll out of Asda @t Home later this year. Asda delivers from 33 stores, and a roll out of the service has been on hold since last year as it has concentrated on "getting service levels right."
Waitrose said it was consolidating the WaitroseDeliver service in the 33 branches where it is already in operation. It missed a target of 36 stores by the end of 2002.
A Waitrose spokesman said: "The performance of WaitroseDeliver has been very positive and the service enjoyed pleasing results over the Christmas period."