We have a 2 1/2 year old bearded collie who seems to be regressing. When she was 6 months old we took her to training, and the trainers more or less said she was daft. Recently she has started toileting in the house, and in the past year or so has got progressively worse on walks. She pulls constantly and tries to attack all other dogs and some people. We cannot let her off the lead atall. We have tried halties, chokers, barking collars and muzzles and so far nothing has worked, WE NEED HELP!

If you can afford to, I suggest that you hire a behaviorist who can come to your home, evaluate these situations and come up with a good treatment plan to guide you through.

In addition, I would have the vet look her over closely and even have bloodwork done just to rule out medical issues that might be contributing to her behavior.

Yep, I would look into the possibility of any medical problems first. There most likely isn't anything wrong but at least you will rule it out.

Then move onto getting the advice of a behaviourist to see what they have to say.
It could be a very simple solution either way.