I understand the need for environmentally-sound visitor centres which combine additional-spend facilities. I also understand the importance of research-based facilities, especially with university links locally. However, the natural landscape of the park really doesn't lend itself to over-developed themed exhibits, and it would be a shame if these continue to appear. The gibbon area is a classic example of this - at a fraction of the cost these animals could have been given something similar to monkey world's siamang enclosure, and the anoa have basically remained with a yard, albeit with some woodchip and temple-themed rockwork as a backdrop, when Marwell has acres of mature woodland and indeed used to house the anoa at times in these woodland paddocks.
With regard to primates, Marwell has long held a successful group of Sulawesi macaques, however guenons and colobus have proven not to be successful here. I am surprised at ISIS now showing a single diana monkey and just 2 male colobus. With two such important species, I would have thought keeping them on rotation with a single outdoor enclosure once the zoo found they were not compatible, and holding a rapidly breeding group of about 10 crested porcupines on the tiled floor of their indoor enclosure for the last few years would not have been a suitable setup for either monkey species. I am sure that, given the last few developments, the possibility of a lower-budget monkey enclosure just being built without all the theming and marketing fanfare and therefore necessary fundraising, would not have been viewed as an option.