I would be careful in attributing Buckfast aggression to Weavers.
I have purchased Italians from a supplier and got gentle ones and
agressive ones. I currently have a mean Carniolian hive. Buckfast
are no different than any other bees. You have the basic traits,
but there will always be exceptions, as noted in comments about
agressive Buckfast in Europe, where Weaver does not supply bees.
Bill Truesdell
Bath, ME
 
Buck Rut wrote:
>
.  Many beekeepers in our area have
> noticed a marked increase in agression of the Buckfast hives.  I know
> from experience too.  I have a Buckfast hive I call the hive from hell!
>