Yes, I well remember seeing the Black-handed Tamarins at Kilverstone. The only other zoo where I've seen this species is Lisbon (several years ago).Another rarely seen primate at Kilverstone, not mentioned elsewhere in this thread, were black-handed tamarins Saguinus niger (or as they were called in those days Saguinus midas niger as they were then considered to be a sub-species of red-handed tamarin).
Checked on Zootierliste, and they fail to show Lisbon as a former holder of this species.