Thanks Gladman. It's quite complex, and not helped by the initial grid ref being way out.
I think the 'Haddenham Barrows' are those south of the road at Earith. Looking via MAGIC one of them is at TL40817489 (I've changed that site to a 'barrow cemetery' focused on that point).
Your grid reference is north of the road, and perhaps that should be a separate group. Most of them are referred to as being at Small Fen. So I have made a different page for those.
I'll add some links to the SMR pages.
TMA Ed.

Cheers Ed.

Seems quite a bit was going on in the area back then..