By Saabira Chaudhuri 

LONDON--On a spring evening in North London, Maneesha Anastasiou visited a wall of lockers at a gas station to do her grocery shopping.

The 31-year-old mother punched in a code on a temperature-controlled locker, which opened to reveal a bag of items she had ordered online the day before from Wal-Mart Stores Inc.'s British supermarket chain, Asda. The whole transaction took under a minute, and Ms. Anastasiou didn't have to unbuckle her baby from her car seat.

Wal-Mart is watching the experience of Ms. Anastasiou and others like her as it races to cater to customers who increasingly shop online. The world's largest retailer by sales is testing online grocery delivery as well as free in-store pickup across five locations in the U.S., in a trial that "leverages best practices from our successful Asda grocery delivery business in the U.K.," the Bentonville, Ark., giant said in its annual report.

Aided by the deep pockets of its parent company, Asda offers online grocery delivery across 97% of the U.K. and is pushing aggressively into "click-and-collect," where customers order online and pick up in person at no extra charge.

The retailer in February bought 15 gas stations, at which it is installing click-and-collect lockers. Asda offers the service at all of its 592 stores and is targeting 1,000 pickup sites by 2018 as it rolls out the service across stand-alone locations like parking lots.

Grocery home delivery is notoriously tough to get right given that different foods need to be kept under various temperatures, while an on-time delivery is essential so as to not alienate hungry customers. It is also widely seen as unprofitable since the delivery fees don't cover the added costs. Grocery pickups, if they catch on widely, could be a good middle ground, since they are convenient for shoppers and less expensive for retailers.

Asda is in the midst of constructing a "supercenter of lockers," at a gas station on a major road between two of the U.K.'s biggest cities, Liverpool and Manchester, says the chain's former retail director, Mark Ibbotson, who now leads innovation for Wal-Mart U.S. That locker center will put Asda on the radar of commuters who might never have shopped there before, he says.

The unit, which should be ready this summer, will be loaded each morning by staff with customers' orders for the day. Robotic arms will then reach in and move these into one of three compartments: frozen, chilled or room temperature. Once a customer punches in a code, the arms locate the orders from their compartments, and put them on a conveyor belt from which they emerge at a collection point for pick up.

Wal-Mart will be watching to see how customers respond--and how the sales stack up against costs. "There's a constant dialogue," Mr. Ibbotson says. "The international team in Bentonville is looking at the U.K.'s experience for the rest of the Wal-Mart world."

As of late last year, Wal-Mart's websites are, in part, run out of what Mr. Ibbotson describes as a "mission control center" in the north of England. The center, along with one in Silicon Valley and another in Bangalore, India, allows the retail giant to have someone watching its websites around the world all the time.

Wal-Mart's push to expand its U.K. business--and harness what it has learned for use in the U.S. and elsewhere--comes as the retailer grapples with increased competition from Amazon.com Inc., which has been expanding its grocery home-delivery service. Other rivals are dabbling with grocery pickups. Whole Foods Market Inc. is piloting a program in Boston, Austin and Philadelphia to let customers pick up groceries ordered through online grocery service Instacart Inc. in their local store. Kroger Co. offers click-and-collect at some of its Harris Teeter stores. Peapod, owned by grocery-chain holding company Royal Ahold NV, has hundreds of pickup points across its U.S. stores, including Stop & Shop.

In the U.S., grocery click-and-collect is still nascent and fragmented, reflecting the immaturity of the online grocery market overall, say analysts. The U.S. is the graveyard for a long list of online grocery delivery services: Webvan Group Inc., HomeRuns.com, ShopLink.com, and Streamline.com, to name a few.

"The underdevelopment of click-and-collect in the U.S. is primarily due to the underdevelopment of e-commerce in food, except in densely populated urban areas like Manhattan," says Bryan Gildenberg, head of research at Kantar Retail.

England, which is also heavily populated, has long been a leader in online grocery delivery, and now click-and-collect is taking off there. Market leader Tesco PLC, offers click-and-collect at about 400 of its nearly 3,500 stores. J Sainsbury PLC, the No. 3 chain by market share, after Asda, in March opened its first click-and-collect sites in stores, with the target of opening 100 by the end of the year.

Data from Mintel estimates that 17% of all U.K. online sales will be collected by customers this year, and that grocery's share of all click-and-collect sales will rise to 7% from 5% in 2014.

Over time, Mr. Gildenberg predicts grocery pickups will catch on in the U.S., too, in a way that is similar to the model in France, where lower population density makes offering home delivery unprofitable. Drive-through grocery pickups account for about 10% of the French grocery market, according to Kantar.

Asda recently set up a team at its headquarters in the Northern English city of Leeds that will evaluate various markets outside the U.S. in which Wal-Mart could offer grocery delivery or pickup. Headed by Saeed Anslow, who previously ran e-commerce development for Asda, the new group also will help Wal-Mart refine its existing grocery efforts outside the U.S.

Asda and Wal-Mart have long drawn from each other for help.

"There are many American accents in Asda House and there are many English accents in Wal-Mart," says Mr. Ibbotson.

Write to Saabira Chaudhuri at saabira.chaudhuri@wsj.com

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