I’m thinking of doing the same, there’s a old Norman church near here at Bishopstone and the Yew tree in the graveyard is ancient and has many perfect branches for the making of a traditional English long bow. I’m not sure if my given right as a Englishman to harvest a stave still exists in law but I’m going to politely ask the Vicar and make a donation to the church of course in the hope that I’ll be allowed to cut one. I’ll need to study up on the making of a horn nock and apparently buffalo horn is best but they are available ready made.