Have Emailed you Richard.
Just a note but I am sure everyone knows.
Badgers and their setts are protected under the Protection of Badgers Act 1992, which makes it illegal to kill, injure or take badgers or to interfere with a badger sett. Interference with a sett includes blocking tunnels or damaging the sett in any way.
Could be wombles?? :-)
I loath badgers, I get this problem regularly but have almost prevented it by regularly spraying with iron sulphate thus driving the worms down deep. Also low electric fence along the boundary may be a good solution.
If you can find the path they are using then poacher alarm mine trip wires work well to put them off....or so I'm told! (not 100% sure of technical legality of this)
You can get them from solway feeds.
You are not taking this seriously Richard:-)