I am having a brain fart, perhaps someone can help:

Am I right in thinking that I (as occupier of premises) have NO duties, liabilities or responsibilities regarding the way in which someone who is NOT working for me carries out their own work while on my premises?

Situation:

Third party is given the right to use land I control. The land is maintained and in good condition for the intended use. They carry out their work in a half-arsed way to a standard WAY below that which we would set to protect our workers. The only risk is to their own employees. Nothing I have done has any bearing on the risks involved. None of the work involved is construction.

I accept there's a moral duty here, and in fact a dangerous activity was stopped. My gut feeling is that anyone on our site should operate by our site rules, but on thinking about it I can't see that we actually have any responsibility here, other than to the condition of the premises and the extent to which our work activities might affect the third party (they don't). But I feel like I'm missing something...

HSAWA - I'm not the employer responsible for the risky work, and I've not engaged them to do it. The relationship if anything is like landlord and tenant.

Occupiers Liability - as above, the premises are fine and nothing I'm doing affects the third party.

So is it true that although I'd act to stop what I saw yesterday again, every time, I've no legal obligation to do so?

There are very few scenarios where as a landlord and employer you do not have any responsibilities for others, however in what you describe you are probably as close as it gets to having none in my opinion.

I think it was going well until the post at #4. The minute you instruct (or engage with them) that they follow your site rules, for example lone working controls, then you form a verbal contract in which your responsibility starts to shift.

I think verbally reminding someone about poor h&s practice hardly constitutes to 'control' over them. Like all things the advice is contextual. On occasions I have advised other contractors not directly associated with my works where I think it appropriate - they can take it or leave it, no liability on my part.

The OLA is concerned with negligence on the part of the occupier, not the unsafe actions of contractor's personnel.

Irrespective of all else a private owner/business cannot let a person who is on their land do as that person wants [e.g. they may bring asbestos on site and bury it or burn rubber tyres thus polluting the atmosphere, or start shooting firearms etc. that reach outside the boundary [the list goes on and on]] so there must be some sort of dialog between parties to ensure that the owner person/business is not put at unnecessary high risk plus section 3 of HSWA applies as do many other laws inclusive of common law & simply talking to a person on your site does not mean that U are controlling them however if U do not manage your undertaking U will be in trouble if that 3rd party does what it wants and something serious happens - so my advice is to control your land etc.