I live 5 minutes away from this "most important henge of its kind outside of Wessex". Unfortunately, it is most unimpressive but if you walk around the circle in the field and imagine what might have gone on all those years ago you will surely smile.
If you park in The ***** pub car park in Old Lakenham and then walk over the river and railway bridges there is a footpath into the field in the direction of the henge. Follow the line of the hedgerow to the South along to towards the house. The henge is between two pylons to the left (east) of the house.
Something is not right. This message is just to keep things from messing up down the road