should be an agm, and as SHU rule 14, QUOTE: Each organisation must register the geographical area it covers, such area not to be exclusive to any single organisationn, ALTERATIONS TO BE APPROVED BY THE UNION> unquote, so you can alter them but before they come into force they must be approved by the union, and this could take time as it would have to be done at a shu council meeting, so its not a matter of having a meeting and altering the boundary there and then,