http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=3126&item=8206718743&rd=1
Maybe an F or a G? You’d have to be quick though… only 16hrs left on the auction from the time of this posting.
Some 23 years ago I knew a man from Co Wexford, Tom WHite, who made the odd set of uilleann pipe and an occasional flute. He had a flute made of bog oak. It was quite nice actually.
FWIW, bog oak (and Bog Larch) is quite plentiful and you’d be able to find larger pieces without too much trouble (in fact the fields along my road have whole trunks weighing a ton in them). In fact if there’s land being cleared people will be happy if you come and take a way a lorryload for free.Bog wood is often wonderfully shaped and often used for sculpting.
The old people had other uses for it, a while ago I visited some friends who had a beautifully shaped piece of bogoak standing outside the house. An old concertinaplayer who was with me said ‘that’s great firewood you have there, we used to burn it all the time’ 
The wood is usually between 3000 and 6000 years old, preserved under layers of turf.
'way too short for a D, although it would be long enough for a head section of mine, and you could add a contrasting body of a different wood. Alas, too narrow though unless the seller was willing to cut some specially. In fact, maybe he’d be willing to cut the right size for a whole whistle.
That stuff is pretty young though… check out the ancient Kauri thread!
“Just right” for bagpipes, and many reedpipes though.
Most of these pipes, including the Northumbrian chanter have bore diameters between 3.5mm and 12mm. Jointed together, pen-blanks make beautiful pipes!! I used Blackwood and Holly blanks to make my first set of twin “Sheperd’s Pipes” (single reeds/double chanters).