I've had two 1/4 logs on the garage floor since about January and I trimmed them down a bit the other week. I've taken them down further into 2 big slabs which are wide enough for warbows and some useful off-cuts.
The wood isn't as good as I'd hoped, there is a lot of blueish discolouration in the sapwood and the sap/heart boundary is all over the place even by my standards, I think it's just too undulating, so what I'll probably do is cut it into heartwood staves, billets and slats for use in bamboo backed Yew bows or crossbow prods or experimental work like flight bows.
I won't be too hasty as it requires some thought to make best use of the wood. I dare say plenty of usable yew gets discarded because it's not perfect... and maybe this is what some people mean when they say English Yew is no good, of course the point is I'm sure you could find similar gnarly wood from anywhere, one is simply limited by choice...
What's the best Yew? The bit that you've actually got!
One pic shows how the heart sap boundary doesn't follow the rings. This Yew was fairly large diameter (about 16") rather than the ideal pipe straight 5 or 6" diameter we'd all love to find.