take your birds and toss them from the new loft location a few times, when you move them keep them hungry for a couple of days a let them out, make sure the old loft is closed up, when they can't get in they will return to the new loft. Back in '95 I moved loft and birds 3 miles on the Saturday, let the birds out at new location on the monday, sent to midweek on the Tues and took 3rd club on the Weds. Only had to go back to old garden to try and catch 1 bird, missed it, ended up with a handfull of tail feather, went home to find the bird sat back in the loft!