In the TBB2 they talk about neolithic Yew that were found with no sapwood or backing. Some were decrowned some had ring violation.
That was the Bow they studied (Ashcott heath)and Boyton recreated it,he studied the Limb and said that it was a wild piece of wood,one he wouldnt contemplate using today but superb workmanship on it.The limb looks pretty much like a Longbow with a slight recurve on the tip and full of pins!
Boyton used various Flint tools and Adze's to make the Bow (which looked superb!) but what i liked best was how they finnished the wood,he poured sand onto a leather pad and used it just like sandpaper! silky smooth.
Mear's made the arrows out of Hazel,flint points held on with nettle threads and Tree sap,the feathers were secured with a sinew wrap around the end quill and Bluebell bulb's squished on the shaft acted like a Glue,they looked great too!