Has anyone got any good articles or links to videos that show good heel work training.

Your subject says lead training but your post heelwork -I'd say this is two totally different things, with lead training being a puppy taught to walk nicely on a lead for normal walks, but heelwork is for competition and usually it is best trained WITHOUT a lead to start with. (As for heelwork you are not expected to use the lead at all.) So really depends on what you are after. There are a lot of good videos on YouTube if you can sort through the bad ones and concentrate on the positive method ones.

This is a nice drawing which gives some good instructions

https://www.facebook.com/K949Training/posts/602958643106172:0

good link . maybe I should start again with brooke and a clicker !