If there is anything that will be endangering persons at work then I would guess the buck would stop with the Health and Safety
http://www.hse.gov.uk/contact/
but remember YOU ALSO HAVE LEGAL OBLIGATIONS UNDER H&S...
So if there is some potentially life threatening practice that you have agreed to do....
Possibly..
you could be one of the persons who could be prosecuted.
The phrase.. "pushed you to do"..
still means you accepted the practice and carried it out..
If you are 100% confident there is a significant danger then you have rights and responsibilities to refuse to do the work.
If you are self employed (and the company is your client), or a sub contractor...
at the end of the day you can always walk away from the contract!!
If you are an employee of the company you can refuse to do dangerous work and instigate the company internal complaints procedure via your line manager..
Have you started off by writing to the company concerned with your complaint and legal reasons behind it ?.
if yes what was their reply?
Doing ANY work is a two way agreement between yourself and someone else...
which implies a level of acceptance of the terms and conditions of the work by yourself..
So unless you have evidence that you have expressed your concerns to them first through the appropriate channels, then this other company may well just say...
Oh yeh he agreed to it, or chose to do it that way and has never complained to us, ????
Guinness