The Atkins Ingrid ferro hull is spec'd at 16 tons; the fiberglass hull is 11.6 tons. The only Ingrid I had ever seen was a ferro hull; but looking on yachtworld it was probably either a one-off or the production of it in a ferro hull was limited to just a few.
Here's the ferro boat I was thinking of:
1971 Atkins Ingrid Cutter Sail Boat For Sale - www.yachtworld.com
With 10,000 lbs extra weight in the hull; I'd say the ferro version is probably better suited to motor sailing or as a permanantly moored live-aboard. I had talked with the owner of that ferro hull boat when I was OTH at Napa and he said he was going to sail it to Eureka, CA from SF; but seeing that it is listed on Yachtworld again I suspect that he either lost faith in the boat or it could not sail upwind very well.