I've never heard the name "camelback shrimp" before, so this may be what the aquarium calls it, but this is Panulirus versicolor (or something similar) which is a species of rock lobster.
Thank you, yes I was rather unsure myself, the labelling was very dark and high up so hard to make out the photo with it, however there were no other tank occupants apart from Cleaner and Fire Shrimps which were obvious. Your description makes more sense. If anyone else can confirm exactly what it is that would be great thanks. I should add it was quite large in size, certainly more lobster size.
After a little research, and answering my own question, yes it looks very much like the Painted Spiny , or Rock Lobster - Panulirus versicolor. The Camel Shrimp has several other common names but is basically a small red shrimp with white markings and a pronounced hump along its back giving it its strange name. I did not see any of these in the exhibit.
