It looks and smells like Pine.

Looks like old SYP heart pine. Great stuff if it is. A lot of floors that were installed in the 1700's are still in existence today.

+1, I'd say old growth long leaf pine.

I'd say Richard hit the trifecta. We cut all those down. Now they grow a pine called slash, most predominantly. It can come to harvest more quickly than long leaf pine.

The two pieces on the outside should be easier to work with that tight, quartersawn grain.

Looks like old YELLA pine to me!

http://www.yellawood.com/

Yep, that is exactly what it is.

Do they have yellow pine in England? My impression was that their pine species was Scots pine. I've never used any but according to the wood-database its hardness looks to be pretty comparable to SYP (and a decent amount harder than Eastern White Pine). I suppose it's possible that it made its way across the ocean.

Yep, yellow pine.

I've never heard of it being sold over here Jeremy, but my father in law was a pattern maker and in his later years took up turning and other woodworking pursuits, he used to go out to a place where they sold all sorts of timber including exotics, so I suppose he could have picked it up when out there. Anyway it's heavy and hard and I'll be using it as an apron around a knock down bench I'm building.
Just checked it out on Google and it is being sold over here now and they gave other names besides Yellow Pine as: American pitch pine, Gulf Coast pitch pine, long leaf pitch pine (UK, USA), southern pine (USA), long leaf pine, short leaf pine, loblolly pine.
I'm going to bed it's midnight here goodnight all and thanks again.