We were told by the landowner of one of our apiary sites that we are going to have to move our hives to another part of the large walled garden where they are at present, due to some renovation work starting on an old large greenhouse at the beginning of April. We thought that the best way to tackle this would be to move the hives permanently to one of our other out apiaries, which is over 3 miles away, and bring the hives from there to the new position in the walled garden. Considering the time of year when would be the best time for the bees to be moved?