Oh the delights of a poo-string... looooovely.
@eggandonion it's a lovely idea to say people can pick and choose the bits from each trainer that they prefer or like the sound of, but this supposes they have enough knowledge about dog training/behaviour in the first place to know whats safe, whats not, what the pitfalls or risks might be of a particular technique or method.
And if they knew that, they wouldn't be picking and choosing from people like Graeme Hall (who is only a 'master trainer' of a 'pay to join' self-assessment professional body... if you pay them £75 and tell them you've trained x number of dogs you can hold his 'qualification' too...) because they'd understand the dangers of the things he (and to be fair, others like him!) does.
The science (and the animal welfare organisations and the veterinary organisations) says positive reinforcement based training/behaviour modification is the safe, effective way forward - this means positive reinforcement with negative punishment (removal of some expected reward) as its 'flip side'.
Within that, there are myriad ways of getting where you need to get with any particular dog.
It's also worth noting that taking a force free, positive reinforcement based approach to training and behaviour modification does not mean you can't occasionally do whatever the heck is necessary to safely manage/prevent accidents! Management is not training!