Top marks to that particular store. But like most big outlets, the service can depend mostly on the individual serving the customer. Our local Tesco, can be a very hit and miss affair, as to the service you receive.
Perhaps in comparison, a friend of mine purchased a laptop last year, which after a couple of weeks proved faulty. The local Tesco store customer service representative 'insisted' that the customer 'had to' contact the manufacturer, "because Tesco have no facilities for checking certain items, including laptops or electrical goods". Eventually the matter was dealt with, only after the requested intervention of the stores duty manager, but it left a very bad opinion of our local Tesco store.