public policy

Dear All,

please clarify in respect of tort of negligence, in particular duty of care.

In Caparo Industries v Dickman House of lords established 3 criteria that must be satisfied for the maker of the statement to owe duty of care to the recepient:
1) it must be resonably foreseeable that th statement will be relied upon by such persons as the claimant
2) theremust be proximity, i.e. close & direct relationsbtw the maker the recepient.
There will be if the statement is made to known person, for a know purpose and it will be used for that purpose
3) in all circustances it must be just and reasonable to impose duty of care, e.g. it must not be contrary to public policy to impose duty of care

SO EXPLAIN WHAT PUBLIC POLICY IS?

Thank you for your advice & time