I am going to explain perturbation, so I will get that over with if the hon. Gentleman does not mind.
Perturbation is where badgers are displaced by the shooting and leave their setts, spreading TB to neighbouring areas. Labour’s trial culls revealed that culling increases TB in badgers by a factor of 1.9 because of perturbation—that is 90%. Ministers affirm that the cull will have hard boundaries to avoid perturbation, but they ignore the fact that the RBCT also had hard boundaries where possible.