Hello, the train service from London to Cambridge is excellent with a lot of trains running between London Terminals and Cambridge so I think this is totally doable. You may want to check the "Off-Peak travel cards" as they are half price with open return - cost wise is good choice. Cambridge will offer you a lot more to see once there so you may want to spend few more hours and take a later train back.

Sorry read this too late ! I hope you had a good weekend non the less! Happy new year!

We don't sell pottery?

Hello, here is the link with Current and Future Exhibitions & Displays. I hope this help! Have a nice day!

That would depend very much on the 5 year old. My seven year old today found the Death on the Nile exhibition pretty dull. But she loved the rest of the museum particularly the hugely varied ground floor galleries. But an Egyptian fanatic might like it. The downstairs Egyptian galleries might be better for a young one, more animals etc. What you might want to try is the Museum of Archeology and Anthropology (also free to enter but check opening days and times.) my daughter loved it particularly the quiz where you get your paper stamped etc.