With the yearling that I am looking after, it was easier because I own the other three horses in the herd so I had full control of how things were for the introduction.
I put an electric fence across a paddock and made sure that there was more than one water source the side that the yearling...
I might as well add what facilities I want for the horses.
1. Good, group turnout every day, ideally 24/7 when possible. I have more than one horse, so I would be happy with being able to have mine as a group. I have also been on yards with separate mare and gelding turnout and this worked...
What a shame that no-one will buddy up.
Maybe see if there is an IH trainer that covers your area? I did find the one who came to me helpful. Being shown the techniques in person by someone who's seen it all before and knows how to time any correction definitely worked.
I know that this is probably really unhelpful advice due to your yard rule about individual turnout, but the best thing that is helping the yearling I am looking after with her manners is my grey mare. She really will take no nonsense from the filly and despite having a trainer out to help me...
The joys of kittens LOL! :D :D :D
DB was dreadful for climbing up people, leaping on them from above or attacking their ankles. Just when you think he's grown out of it, he reminds you that in fact he still can if he wants to... naughty so and so! ;) :p
I know someone who used to have a horse at Nantmawr. IIRC she hacked around the little lanes and enjoyed it.
Another person I know used to ride on the Long Mind, so not the Tanat Valley area, but she said it was amazing hacking. It's too far from me so I don't know about parking there.