Yes, this is also interesting.

At Thornborough and also at Tara, there is clear indications of continuity of use into the Iron Age (Tara beyond). The IA remains at Tbro were the sq barrows and the horse burials that were interpreted as "ritual " activity and I would definately regard them as am important part of the story. Also, the Mesolithic double pit alignment - that was at least 1,000 years before even the cursus was built. It its way, this is potentially even more important that the henges.