Building Regulations Approved Document B recommends that fire doors are installed by members of an independent product conformity certification scheme :
Independent certification schemes
There are many UK product certification schemes. Such schemes certify compliance with the requirements of a recognised document which is appropriate to the purpose for which the material is to be used. Materials which are not so certified may still conform to a relevant standard.
Many certification bodies which approve such schemes are accredited by UKAS.
Since the fire performance of a product, component or structure is dependent upon satisfactory site installation and maintenance, independent schemes of certification and registration of installers and maintenance forms of such will provide confidence in the appropiate standard of worksmanship being provided.
Frame fixing and hinge locations
Recommendations are shown below. For full information see Frame installation guide