I have summarised some of the legislation for you
Health and Safety at Work etc. Act 1974
Section 2 General duties of employers to their employees..
(1) It shall be the duty of every employer to ensure, so far as is reasonably practicable, the health, safety and welfare at work of all his employees..
(2)Without prejudice to the generality of an employer’s duty under the preceding subsection, the matters to which that duty extends include in particular—.
(a)the provision and maintenance of plant and systems of work that are, so far as is reasonably practicable, safe and without risks to health;.
(b)arrangements for ensuring, so far as is reasonably practicable, safety and absence of risks to health in connection with the use, handling, storage and transport of articles and substances;.
(c)the provision of such information, instruction, training and supervision as is necessary to ensure, so far as is reasonably practicable, the health and safety at work of his employees;.
(d)so far as is reasonably practicable as regards any place of work under the employer’s control, the maintenance of it in a condition that is safe and without risks to health and the provision and maintenance of means of access to and egress from it that are safe and without such risks;.
(e)the provision and maintenance of a working environment for his employees that is, so far as is reasonably practicable, safe, without risks to health, and adequate as regards facilities and arrangements for their welfare at work
Section 3 General duties of employers and self-employed to persons other than their employees.
(1)It shall be the duty of every employer to conduct his undertaking in such a way as to ensure, so far as is reasonably practicable, that persons not in his employment who may be affected thereby are not thereby exposed to risks to their health or safety.
(2)It shall be the duty of every self-employed person to conduct his undertaking in such a way as to ensure, so far as is reasonably practicable, that he and other persons (not being his employees) who may be affected thereby are not thereby exposed to risks to their health or safety.
(3)In such cases as may be prescribed, it shall be the duty of every employer and every self-employed person, in the prescribed circumstances and in the prescribed manner, to give to persons (not being his employees) who may be affected by the way in which he conducts his undertaking the prescribed information about such aspects of the way in which he conducts his undertaking as might affect their health or safety.
and re the employees actions and responsibilities
Section 7 General duties of employees at work
It shall be the duty of every employee while at work—
(a)to take reasonable care for the health and safety of himself and of other persons who may be affected by his acts or omissions at work; and
(b)as regards any duty or requirement imposed on his employer or any other person by or under any of the relevant statutory provisions, to co-operate with him so far as is necessary to enable that duty or requirement to be performed or complied with.
there are lots more elements to this including the Management of Health and Safety at Work Regulations 1999 but it gets boring.