Utilize the input text as a context reference, choose the right relationship between Russell Group and London from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

* Rolls-Royce's biggest shareholder ValueAct is in for the long haul Elsewhere, the London Stock Exchange Group began to reap the benefits of acquiring the Russell Group , as robust growth in the index business helped Europe’s oldest independent bourse post a 27pc rise in half-year adjusted operating profit to £366.1m.

Answer: headquarters_location