I hope you don't mind me asking here as I don't HE, but I thought that people who did might be able to help.
DS2 is 6 and is completely obsessed with the Celts. He has spent the whole summer learning abou them. He uses the BBC KS2 website and has Usbourne books about both Celts and Romans as well as the Horrible Histories book and the fiction book by the same author called "Captured Celts". We have also taken him to a reconstructed Hill Fort, and he spends hours in the archaeology section of the local museum.
Are there any other fantastic resources out there that he would enjoy? It keeps him lovely and quiet during the holidays so I am all for encouraging it!