What is this furry, long-limbed, presumably tree-dwelling creature?
It looks like a taxidermic specimen of a gray slender loris (Loris lydekkerianus), but it does look pale in color. The lack of color distinction in the fur may be because it is a non-living specimen. The links below may be helpful with more detail.

https://en.wikipedia.org/wiki/Gray_slender_loris

https://www.shaldonwildlifetrust.org.uk/page/grey-slender-loris.html

https://www.youtube.com/watch?v=yU3n0BlUP0A