Having read a few biographys of some of the late great terriermen.It is intresting that most of them quite liked a bit of bushing and as much variety for their terriers as possable.You obviously have to take the written word with a pinch of salt,the lads I know who dig regularly and with good results use the terriers as much and as in as many situations as possable.When out actualy checking promising earths the dogs are coupled when its more of a mooch a terrier or 2 will be running loose.A lot of terriers have self entered this way.
What ever way you do it,best of luck to all for the coming