Galvanised mesh narrow panel to stop badgers (Clive Vale TN35)

The sneaky blighters have found a way of getting into the side of the garden that is off limits to them, so now the battle continues to keep them out of it and to persuade them that the three-quarters of my garden in which they are permitted to roam free has to suffice! Am looking for any small-bore galvanised mesh that I can bury to discourage the digging of very determined raiding parties!