[de_dave]

This isn't strictly true. I know in South London that Tesco orders are not "picked from local stores by hand" - they're packed in and dispatched from the same enormous warehouses and depots that supply the stores, and there's some degree of automation involved (although not to the same level of Ocado.)

[setquk]

They only do that where there wasn’t enough room to build the home shopping distribution bays on the existing stores.