 
 <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. <hau> Hukuncin da ya dace a cikin nassi shine: A cikin 1987 ya zama kamfani mai zaman kansa tare da ma'aikata 33 sakamakon sayan gudanarwa, wanda Rod Aldridge ya jagoranta, kuma an fara jera shi a Kasuwancin Landan a 1991. Saboda haka, amsar ita ce 1991. 