Utilize the input text as a context reference, choose the right relationship between Elementis 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.

LONDON (ShareCast) - (ShareCast News) - Chemicals group Elementis (LSE: ELM.L - news ) saw its first half pre-tax profit decline, as its oil and gas related and businesses reported a drop in sales.

Answer: headquarters_location