 <translate> The relevant sentence in the passage is: In 1987 it became an independent company with 33 staff as a result of a management buy-out, led by Rod Aldridge, and was first listed on the London Stock Exchange in 1991.
So, the answer is 1991. <yor> Ọrọ ti o yẹ ninu ọrọ naa ni: Ni ọdun 1987 o di ile-iṣẹ ominira pẹlu awọn oṣiṣẹ 33 bi abajade ti rira iṣakoso kan, ti Rod Aldridge ṣe olori, ati pe o kọkọ ṣe akojọ lori Iṣowo Iṣowo Ilu London ni ọdun 1991. Nítorí náà, ìdáhùn náà ni 1991. 