Buddleia (Newbold Verdon LE9)

c.5ft purple buddleia flowering this month (pic shows last Nov), can be cut back & survive (let me know if to be done before collection & how much), needs digging up, I have all necessary tools & can help but not do it all myself; suggest days/times to come get it from opposite Newbold Verdon pharmacy (it's the smaller buddleia near the front door, not the giant by the telegraph pole!)