Visitors to the museum see only a fraction of the staggering 80 million items in the collection. This programme reveals the unique and rare pieces too valuable to exhibit.

Susie and Paul follow up a tip off about some possible dino footprints in Wales. Dippy the Diplodocus is on a trip around the country and needs an inspection to make sure it’s safe.

Susie tries to piece together the skeleton of a T-Rex whose bones have got mixed up with another specimen. The museum instigates a great British bug hunt.

Sue believes that a dinosaur skull from a dig in Africa maybe 200 million years old. The museum gears up to host the Wildlife Photographer of the Year exhibition.