The two Sykes monkeys died around 1992 possibly early 1993, they were housed in the old monkey house ( Terrible old building ), We built the new monkey house between 1992 & 1993 and then moved the Spider monkeys over and Squirrel monkeys and brought in Colobus and Ruffed Lemurs, The sykes had died by that time so it's around 92 or 93.
The Spider monkey without a tail was called Missy, She was wild caught in 1958, She suffered a stroke many years ago and had her tail amputated due to it being paralyzed.
I couldn't tell you why they were not placed with another zoo, possibly because A) either no one wanted them, or B) Cefn yr erw had already said they would take all the primates.
I don't remember a mandrill from southport ever going to Cefn yr erw, but as I said it was nearly 4 years ago, so I might be wrong it was a bad time within the zoo saying goodbye to everything that you had looked after for many years