We do not have a handbook, just a USB stick we issue to all managers with policies and procedures. Is this ok?

For the most part, policies set out in a staff handbook are there as a matter of good practice, to set out standard expected of employees, to assist the running of the business, and to reduce legal risk by making sure employees and managers understand the legal rights and responsibilities inherent in the employment relationship. 

There is a minimum level of information that must be given by employers to their employees in writing. Much of this must be given in a single written statement of terms under Article 33 of the Employment Rights (Northern Ireland) Order 1996, which will usually be given in the form of a statement, a letter of engagement or a written employment contract or other