We usually get our shopping delivered by ASDA. We pay them an annual subscription (I think it's £60 per year) and they drop our shopping off. We spend around £70 per week at the minute (2 adults), as we're eating out way less than usual.
We only buy ASDA branded food, with the exception of baked beans, tuna and soft drinks (ASDA's 'spreadable butter' is just as nice as Lurpack and costs £2 less!) What's great about their home deliveries is that they 'substitute' own brand items with branded items at no extra cost to us (if they're out of stock or bad dates etc). If we have anything we want to send back, they refund it but won't let us hand it back to the driver. We genuinely accidentally ordered 2 bottles of gin last week and got them for free!
