Almost 2 years ago we switched from using Tesco and their delivery service to Asda. It was an unmittigated disaster. We have now returned to Tesco and use their home delivery. yes you pay a few pennies more, but the quality of the service is far far superior. Decent sell by dates, few substitutions (and those there are have been reasonably thought out). On time deliveries, some even arrive early! One delivery suffered a vehicle breakdown. We received a very apologetic phone call from the driver, but at our suggestion we went to the van and collected our shopping. We took the opportunity to take a cuppa to the driver, who was appreciative. Tesco have clearly majored on customer service and all is good!