Just to clarify, nobody is
officially claiming that its a "world" record. I used that term because (as far as I'm aware) nobody in the
world has managed to shoot a Livery arrow from a Mary Rose class bow 306 yards. If that can be otherwise proven then great. As it stands, it's the first record of it occurring which (in my mind) makes it a world record.
If I've got the definition of "world record" wrong, I'd be more than happy to know the correct one. I do however currently stand by my belief that a world record is quite simply a record set under globally accepted specifications, which this is, considering the EWBS specifications for arrows and bows are accepted worldwide.
Certainly if the EWBS specs were only accepted in the UK, this wouldn't be a world record.