Niggeloh harnesses, very pretty. Bought by dog owners to make them feel good. I think I paid about a tenner for a harness for the pup and now he uses the Kopov's old harness again about a tenner.
Tracking leads need to be about 10 mtrs long. Biothane ones get less tangled up and the orange washing line type work well. A 30 mtr lead is just ridiculous.
If the dog is pulling it needs some training.
Some of these threads about dogs running down and holding deer sound like they come from the, Pikey hand book on running dogs.
If people are getting so many runners perhaps they should up their shooting skills.