Interesting place, the mounds are Romano-British but the whole site has a much older feel to it.
The notice board says that five roads used to meet at the crossing and the Romans built a temple on the riverbank. I suspect that all this activity took place on an exisiting site.
Anyway it was chucking down with rain today and the Mounds look a lot nicer when the suns out so I will come back and explore further in the Sping.