Question: Where is the brand and buying group which  Filco foods has 8 stores and operates as part of located 

Context paragraphs:
Proton (supermarkets): Proton is a Greek based retail chain of independent retailers (primarily grocery shops) operating as a brand and buying group (or symbol group).  All stores are independently owned.  The parent company (ELETA LTD) is communally owned with each retailer owning a share.  As of 2006, the Proton retail network consists of around 390 stores throughout Greece.  They also sell their own brand of cola, Proton Cola.

Coop (Hungary): Coop is a Hungarian supermarket chain and buying group with about 4000 stores.  In 2015, it is the second largest retail chain in Hungary.

United Hardware Distributing Company: United Hardware Distributing Co. is a dealer-owned corporation based in Plymouth, Minnesota which provides distribution services for about 610 member-owned stores, the majority of which operate under the Hardware Hank trade name.  In addition, the company services about 800 other stores owned by non-members.  2006 sales were $183 million.  It was founded in 1945 as a furniture and hardware distributor.  The furniture division was sold in 1953, and it became a dealer-owned retailers' cooperative in 1957 when majority control was assumed by a group of hardware store owners.  In addition to servicing the Hardware Hank stores, United Hardware also services TrustWorthy Hardware Stores, Golden Rule Lumber Centers, and Ranch & Pet Supply stores.  It is a member of the Distribution America buying group.

Nisa (retailer): Nisa Retail Limited (formerly Nisa-Today's) is a brand and buying group (or "symbol group") of independent retailers (primarily small grocery shops) and wholesalers in the United Kingdom.  It is a mutual organisation owned by its members and operating "...like a co-operative, using the collective buying power of the large group of members to negotiate deals with suppliers".

Warehouse store: A warehouse store or warehouse supermarket is a food and grocery retailer that operates stores geared toward offering deeper discounted prices than a traditional supermarket.  These stores offer a no-frills experience and warehouse shelving stocked well with merchandise intended to move at higher volumes.  Unlike warehouse clubs, warehouse stores do not require a membership or membership fees. Warehouse stores also offer a selection of merchandise sold in bulk, Typically warehouse stores are laid out in a logical format which leads people a certain way around the store to the checkout.  As one enters the store they are directed down an aisle of discounted special buys when entering the store.  From there the layout typically then leads to the fresh Produce followed by the Deli at the back of the store.  Also included bakery and other departments similar to other supermarkets.  Another typical feature of these stores is that the customer bags their own groceries which also helps to reduce the overall cost.  Many warehouse stores are operated by traditional grocery chains both as a way to attract lower income, value conscious consumers and to maximize their buying power in order to lower costs at their mainstream stores.  Notable examples of corporations who operate warehouse stores include United States chains Kroger and Albertsons LLC and the smaller Sacramento-based Nugget Market.  However, WinCo Foods is an exception as it is a warehouse chain of its own and not part of a larger chain of traditional supermarkets like A&P, Safeway, Kroger, or Supervalu.

Digitas Health: Digitas Health is an interactive marketing agency catering exclusively to healthcare and pharmaceutical companies.  The company was founded in 1990 as Medical Broadcasting Corporation and became a unit of Digitas in 2006 as Digitas Health.  In 2011, the agency became independent of Digitas, and integrated into the Publicis Healthcare Communications Group (PHCG), the world’s largest healthcare communications network.  PHCG is part of Paris-based Publicis Groupe the world’s third largest communications group, second largest media counsel and buying group, and a global leader in digital and healthcare communications.

Crest Foods: Crest Foods is a family owned and operated business chain of grocery stores in Oklahoma, with the corporate office in Edmond.  As of 2017, there are 8 stores and a 9th store will open in late 2017 or early 2018.  It buys direct from 150 manufacturers and the largest supplier in the state.

Toymaster: Toymaster is an association of independently owned toy stores formed in 1977 as a buying group.  , it comprises over 250 independently owned toy retailers in the United Kingdom and Ireland.  There are six in Wales, three in Jersey, one in Guernsey and three on the Isle of Man.

Filco Foods: Filco Foods is an independent grocery chain based in Llantwit Major, Vale of Glamorgan, Wales.  As of 2013, Filco has 8 stores and operates as part of the Nisa group.  Filco Foods was founded by Phillip Jones in 1946.  The original location opened on Wine Street in Llantwit Major in 1946.  Goods were packaged and delivered according to the customer shopping lists.  In 2010 the company celebrated its 65th anniversary with a charity drive.

Co-operative Federal Trading Services: The Co-operative Federal Retail and Trading Services is the central buying group for co-operative retail societies in the United Kingdom.  It came into its current structure in 2015, though its predecessor was established in 1993, and it supplies almost all food bought for sale by the over 4,000 co-operative foodstores in the UK.  The buying group is owned and controlled by each of its member societies but is managed by The Co-operative Group on their behalf.  It operates by pooling the collective £8.5bn buying power for 18 co-operative societies in the UK, allowing them to negotiate better prices from suppliers, so as to compete effectively with other UK supermarket chains.

Supporting paragraphs: Filco Foods Nisa (retailer)
Answer: the United Kingdom