Banner waving animal rights campaigners targetted the Brentford based GlaxoSmithKlein building on the Great West Road on Friday (April, 28).
The campaigners, who are part of the Stop Huntingdon Animal Cruelty Group, protested peacefully and were watched closely by police.
According to the protestors GlaxoSmithKlein is one of the biggest customers of notorious animal testing laboratory Huntingdon Life Sciences.
The protest was one of five similar events taking place at companies in the south east who use the laboratory for animal testing.
A spokesman for GlaxoSmithKlein said although it accepted people's right to peacefully protest it rejected the argument put forward by the campaigners.
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