From my experience,I have gone to marums to break dogs in
Its changed hands a few times in the last ten years but always
been a safe track to break pups in and trial a good race dog that you
dont wont to show up on racing track trials,
I have had dogs for 15 years and buy only 1 or 2 pups at a time and break them in myself,
I Give them plenty of free galloping up straight tracks to a sheep skin to 13/14months to they mature
Never sent dogs to marums to break in,but there always willing to help you
with fresh rabbits in there bullring or track,
The track is not narrow like some breaking tracks where i'have seen
pups come back from breakers with broken hocks
I recommend breaking dogs in yourself if your got the time and not too many numbers
All the best